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partially done with refactoring

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This commit is contained in:
John Tramm 2019-11-21 22:19:15 +00:00
parent 0ebfae4ef5
commit 5502f38580
31 changed files with 301 additions and 256 deletions
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16
include/openmc/distribution.h
View file

@ -35,7 +35,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
// Properties
const std::vector<double>& x() const { return x_; }
@ -59,7 +59,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
double a_; //!< Lower bound of distribution
double b_; //!< Upper bound of distribution
@ -76,7 +76,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
double theta_; //!< Factor in exponential [eV]
};
@ -92,7 +92,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
double a_; //!< Factor in exponential [eV]
double b_; //!< Factor in square root [1/eV]
@ -109,7 +109,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
double mean_value_; //!< middle of distribution [eV]
double std_dev_; //!< standard deviation [eV]
@ -127,7 +127,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
// example DT fusion m_rat = 5 (D = 2 + T = 3)
// ion temp = 20000 eV
@ -149,7 +149,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
// x property
std::vector<double>& x() { return x_; }
@ -179,7 +179,7 @@ public:
//! Sample a value from the distribution
//! \return Sampled value
double sample() const;
double sample(uint64_t * prn_seeds, int stream) const;
private:
std::vector<double> x_; //! Possible outcomes
};

2
include/openmc/distribution_angle.h
View file

@ -24,7 +24,7 @@ public:
//! Sample an angle given an incident particle energy
//! \param[in] E Particle energy in [eV]
//! \return Cosine of the angle in the range [-1,1]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
//! Determine whether angle distribution is empty
//! \return Whether distribution is empty

14
include/openmc/distribution_energy.h
View file

@ -22,7 +22,7 @@ namespace openmc {
class EnergyDistribution {
public:
virtual double sample(double E) const = 0;
virtual double sample(double E, uint64_t * prn_seeds, int stream) const = 0;
virtual ~EnergyDistribution() = default;
};
@ -37,7 +37,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
int primary_flag_; //!< Indicator of whether the photon is a primary or
//!< non-primary photon.
@ -56,7 +56,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
double threshold_; //!< Energy threshold in lab, (A + 1)/A * |Q|
double mass_ratio_; //!< (A/(A+1))^2
@ -75,7 +75,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
//! Outgoing energy for a single incoming energy
struct CTTable {
@ -104,7 +104,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
Tabulated1D theta_; //!< Incoming energy dependent parameter
double u_; //!< Restriction energy
@ -122,7 +122,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
Tabulated1D theta_; //!< Incoming energy dependent parameter
double u_; //!< Restriction energy
@ -140,7 +140,7 @@ public:
//! Sample energy distribution
//! \param[in] E Incident particle energy in [eV]
//! \return Sampled energy in [eV]
double sample(double E) const;
double sample(double E, uint64_t * prn_seeds, int stream) const;
private:
Tabulated1D a_; //!< Energy-dependent 'a' parameter
Tabulated1D b_; //!< Energy-dependent 'b' parameter

8
include/openmc/distribution_multi.h
View file

@ -24,7 +24,7 @@ public:
//! Sample a direction from the distribution
//! \return Direction sampled
virtual Direction sample() const = 0;
virtual Direction sample(uint64_t * prn_seeds, int stream) const = 0;
Direction u_ref_ {0.0, 0.0, 1.0}; //!< reference direction
};
@ -40,7 +40,7 @@ public:
//! Sample a direction from the distribution
//! \return Direction sampled
Direction sample() const;
Direction sample(uint64_t * prn_seeds, int stream) const;
private:
UPtrDist mu_; //!< Distribution of polar angle
UPtrDist phi_; //!< Distribution of azimuthal angle
@ -56,7 +56,7 @@ public:
//! Sample a direction from the distribution
//! \return Sampled direction
Direction sample() const;
Direction sample(uint64_t * prn_seeds, int stream) const;
};
//==============================================================================
@ -70,7 +70,7 @@ public:
//! Sample a direction from the distribution
//! \return Sampled direction
Direction sample() const;
Direction sample(uint64_t * prn_seeds, int stream) const;
};
using UPtrAngle = std::unique_ptr<UnitSphereDistribution>;

10
include/openmc/distribution_spatial.h
View file

@ -17,7 +17,7 @@ public:
virtual ~SpatialDistribution() = default;
//! Sample a position from the distribution
virtual Position sample() const = 0;
virtual Position sample(uint64_t * prn_seeds, int stream) const = 0;
};
//==============================================================================
@ -30,7 +30,7 @@ public:
//! Sample a position from the distribution
//! \return Sampled position
Position sample() const;
Position sample(uint64_t * prn_seeds, int stream) const;
private:
UPtrDist x_; //!< Distribution of x coordinates
UPtrDist y_; //!< Distribution of y coordinates
@ -47,7 +47,7 @@ public:
//! Sample a position from the distribution
//! \return Sampled position
Position sample() const;
Position sample(uint64_t * prn_seeds, int stream) const;
private:
UPtrDist r_; //!< Distribution of r coordinates
UPtrDist theta_; //!< Distribution of theta coordinates
@ -65,7 +65,7 @@ public:
//! Sample a position from the distribution
//! \return Sampled position
Position sample() const;
Position sample(uint64_t * prn_seeds, int stream) const;
// Properties
bool only_fissionable() const { return only_fissionable_; }
@ -87,7 +87,7 @@ public:
//! Sample a position from the distribution
//! \return Sampled position
Position sample() const;
Position sample(uint64_t * prn_seeds, int stream) const;
private:
Position r_; //!< Single position at which sites are generated
};

26
include/openmc/math_functions.h
View file

@ -129,11 +129,15 @@ extern "C" void calc_zn_rad(int n, double rho, double zn_rad[]);
//! \param mu The cosine of angle in lab or CM
//! \param phi The azimuthal angle; will randomly chosen angle if a nullptr
//! is passed
//! \param prn_seeds A pointer to the array of pseudorandom seeds
//! \param stream The pseudorandom stream index with which to sample from
//==============================================================================
extern "C" void rotate_angle_c(double uvw[3], double mu, const double* phi);
extern "C" void rotate_angle_c(double uvw[3], double mu, const double* phi,
uint64_t * prn_seeds, int stream);
Direction rotate_angle(Direction u, double mu, const double* phi);
Direction rotate_angle(Direction u, double mu, const double* phi,
uint64_t * prn_streams, int stream);
//==============================================================================
//! Samples an energy from the Maxwell fission distribution based on a direct
@ -144,10 +148,12 @@ Direction rotate_angle(Direction u, double mu, const double* phi);
//! rule C64 in the Monte Carlo Sampler LA-9721-MS.
//!
//! \param T The tabulated function of the incoming energy
//! \param prn_seeds A pointer to the array of pseudorandom seeds
//! \param stream The pseudorandom stream index with which to sample from
//! \return The sampled outgoing energy
//==============================================================================
extern "C" double maxwell_spectrum(double T);
extern "C" double maxwell_spectrum(double T, uint64_t * prn_seeds, int stream);
//==============================================================================
//! Samples an energy from a Watt energy-dependent fission distribution.
@ -159,10 +165,12 @@ extern "C" double maxwell_spectrum(double T);
//!
//! \param a Watt parameter a
//! \param b Watt parameter b
//! \param prn_seeds A pointer to the array of pseudorandom seeds
//! \param stream The pseudorandom stream index with which to sample from
//! \return The sampled outgoing energy
//==============================================================================
extern "C" double watt_spectrum(double a, double b);
extern "C" double watt_spectrum(double a, double b, uint64_t * prn_seeds, int stream);
//==============================================================================
//! Samples an energy from the Gaussian energy-dependent fission distribution.
@ -175,10 +183,13 @@ extern "C" double watt_spectrum(double a, double b);
//!
//! @param mean mean of the Gaussian distribution
//! @param std_dev standard deviation of the Gaussian distribution
//! @param prn_seeds A pointer to the array of pseudorandom seeds
//! @param stream The pseudorandom stream index with which to sample from
//! @result The sampled outgoing energy
//==============================================================================
extern "C" double normal_variate(double mean, double std_dev);
extern "C" double normal_variate(double mean, double std_dev, uint64_t * prn_seeds,
int stream);
//==============================================================================
//! Samples an energy from the Muir (Gaussian) energy-dependent distribution.
@ -190,10 +201,13 @@ extern "C" double normal_variate(double mean, double std_dev);
//! @param e0 peak neutron energy [eV]
//! @param m_rat ratio of the fusion reactants to AMU
//! @param kt the ion temperature of the reactants [eV]
//! @param prn_seeds A pointer to the array of pseudorandom seeds
//! @param stream The pseudorandom stream index with which to sample from
//! @result The sampled outgoing energy
//==============================================================================
extern "C" double muir_spectrum(double e0, double m_rat, double kt);
extern "C" double muir_spectrum(double e0, double m_rat, double kt, uint64_t * prn_seeds,
int stream);
//==============================================================================
//! Doppler broadens the windowed multipole curvefit.

9
include/openmc/mgxs.h
View file

@ -154,8 +154,10 @@ class Mgxs {
//! @param gin Incoming energy group.
//! @param dg Sampled delayed group index.
//! @param gout Sampled outgoing energy group.
//! @param prn_seeds Pseudorandom seed array.
//! @param stream Pseudorandom stream index.
void
sample_fission_energy(int gin, int& dg, int& gout);
sample_fission_energy(int gin, int& dg, int& gout, uint64_t * prn_seeds, int stream);
//! \brief Samples the outgoing energy and angle from a scatter event.
//!
@ -163,8 +165,11 @@ class Mgxs {
//! @param gout Sampled outgoing energy group.
//! @param mu Sampled cosine of the change-in-angle.
//! @param wgt Weight of the particle to be adjusted.
//! @param prn_seeds Array of pseudorandom stream seeds
//! @param stream Pseudorandom stream index
void
sample_scatter(int gin, int& gout, double& mu, double& wgt);
sample_scatter(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds,
int stream);
//! \brief Calculates cross section quantities needed for tracking.
//!

11
include/openmc/photon.h
View file

@ -45,12 +45,12 @@ public:
void calculate_xs(Particle& p) const;
void compton_scatter(double alpha, bool doppler, double* alpha_out,
double* mu, int* i_shell) const;
double* mu, int* i_shell, uint64_t * prn_seeds, int stream) const;
double rayleigh_scatter(double alpha) const;
double rayleigh_scatter(double alpha, uint64_t * prn_seeds, int stream) const;
void pair_production(double alpha, double* E_electron, double* E_positron,
double* mu_electron, double* mu_positron) const;
double* mu_electron, double* mu_positron, uint64_t * prn_seeds, int stream) const;
void atomic_relaxation(const ElectronSubshell& shell, Particle& p) const;
@ -96,14 +96,15 @@ public:
xt::xtensor<double, 2> dcs_;
private:
void compton_doppler(double alpha, double mu, double* E_out, int* i_shell) const;
void compton_doppler(double alpha, double mu, double* E_out, int* i_shell,
uint64_t * prn_seeds, int stream) const;
};
//==============================================================================
// Non-member functions
//==============================================================================
std::pair<double, double> klein_nishina(double alpha);
std::pair<double, double> klein_nishina(double alpha, uint64_t * prn_seeds, int stream);
void free_memory_photon();

10
include/openmc/physics.h
View file

@ -59,7 +59,7 @@ void sample_photon_product(int i_nuclide, const Particle* p, int* i_rx, int* i_p
void absorption(Particle* p, int i_nuclide);
void scatter(Particle*, int i_nuclide);
void scatter(Particle* p, int i_nuclide);
//! Treats the elastic scattering of a neutron with a target.
void elastic_scatter(int i_nuclide, const Reaction& rx, double kT,
@ -72,15 +72,17 @@ void sab_scatter(int i_nuclide, int i_sab, Particle* p);
//! dependence of cross sections in treating resonance elastic scattering such
//! as the DBRC and a new, accelerated scheme are also implemented here.
Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
Direction v_neut, double xs_eff, double kT);
Direction v_neut, double xs_eff, double kT, uint64_t * prn_seeds, int stream);
//! samples a target velocity based on the free gas scattering formulation, used
//! by most Monte Carlo codes, in which cross section is assumed to be constant
//! in energy. Excellent documentation for this method can be found in
//! FRA-TM-123.
Direction sample_cxs_target_velocity(double awr, double E, Direction u, double kT);
Direction sample_cxs_target_velocity(double awr, double E, Direction u, double kT,
uint64_t * prn_seeds, int stream);
void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Particle::Bank* site);
void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Particle::Bank* site,
uint64_t * prn_seeds, int stream);
//! handles all reactions with a single secondary neutron (other than fission),
//! i.e. level scattering, (n,np), (n,na), etc.

2
include/openmc/plot.h
View file

@ -285,7 +285,7 @@ void create_voxel(Plot pl);
//! Create a randomly generated RGB color
//! \return RGBColor with random value
RGBColor random_color();
RGBColor random_color(uint64_t * prn_seeds, int stream);
} // namespace openmc

5
include/openmc/reaction_product.h
View file

@ -42,7 +42,10 @@ public:
//! \param[in] E_in Incoming energy in [eV]
//! \param[out] E_out Outgoing energy in [eV]
//! \param[out] mu Outgoing cosine with respect to current direction
void sample(double E_in, double& E_out, double& mu) const;
//! \param[inout] prn_seeds Pseudorandom array of stream seeds
//! \param[in] stream Psuedorandom stream index
void sample(double E_in, double& E_out, double& mu, uint64_t * prn_seeds,
int stream) const;
Particle::Type particle_; //!< Particle type
EmissionMode emission_mode_; //!< Emission mode

15
include/openmc/scattdata.h
View file

@ -65,8 +65,11 @@ class ScattData {
//! @param gout Sampled outgoing energy group.
//! @param mu Sampled cosine of the change-in-angle.
//! @param wgt Weight of the particle to be adjusted.
//! @param prn_seeds Array of pseudorandom stream seeds
//! @param stream Pseudorandom stream index
virtual void
sample(int gin, int& gout, double& mu, double& wgt) = 0;
sample(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds,
int stream) = 0;
//! \brief Initializes the ScattData object from a given scatter and
//! multiplicity matrix.
@ -109,8 +112,10 @@ class ScattData {
//! @param gin Incoming energy group.
//! @param gout Sampled outgoing energy group.
//! @param i_gout Sampled outgoing energy group index.
//! @param prn_seeds Array of pseudorandom stream seeds
//! @param stream Pseudorandom stream index
void
sample_energy(int gin, int& gout, int& i_gout);
sample_energy(int gin, int& gout, int& i_gout, uint64_t * prn_seeds, int stream);
//! \brief Provides a cross section value given certain parameters
//!
@ -161,7 +166,7 @@ class ScattDataLegendre: public ScattData {
calc_f(int gin, int gout, double mu);
void
sample(int gin, int& gout, double& mu, double& wgt);
sample(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds, int stream);
size_t
get_order() {return dist[0][0].size() - 1;};
@ -197,7 +202,7 @@ class ScattDataHistogram: public ScattData {
calc_f(int gin, int gout, double mu);
void
sample(int gin, int& gout, double& mu, double& wgt);
sample(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds, int stream);
size_t
get_order() {return dist[0][0].size();};
@ -238,7 +243,7 @@ class ScattDataTabular: public ScattData {
calc_f(int gin, int gout, double mu);
void
sample(int gin, int& gout, double& mu, double& wgt);
sample(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds, int stream);
size_t
get_order() {return dist[0][0].size();};

6
src/bremsstrahlung.cpp
View file

@ -65,7 +65,7 @@ void thick_target_bremsstrahlung(Particle& p, double* E_lost)
double y = std::exp(y_l + (y_r - y_l)*f);
// Sample number of secondary bremsstrahlung photons
int n = y + prn();
int n = y + prn(p.prn_seeds, p.stream);
*E_lost = 0.0;
if (n == 0) return;
@ -73,7 +73,7 @@ void thick_target_bremsstrahlung(Particle& p, double* E_lost)
// Sample index of the tabulated PDF in the energy grid, j or j+1
double c_max;
int i_e;
if (prn() <= f || j == 0) {
if (prn(p.prn_seeds, p.stream) <= f || j == 0) {
i_e = j + 1;
// Interpolate the maximum value of the CDF at the incoming particle
@ -94,7 +94,7 @@ void thick_target_bremsstrahlung(Particle& p, double* E_lost)
for (int i = 0; i < n; ++i) {
// Generate a random number r and determine the index i for which
// cdf(i) <= r*cdf,max <= cdf(i+1)
double c = prn()*c_max;
double c = prn(p.prn_seeds, p.stream)*c_max;
int i_w = lower_bound_index(&mat->cdf(i_e, 0), &mat->cdf(i_e, 0) + i_e, c);
// Sample the photon energy

32
src/distribution.cpp
View file

@ -35,11 +35,11 @@ Discrete::Discrete(const double* x, const double* p, int n)
normalize();
}
double Discrete::sample() const
double Discrete::sample(uint64_t * prn_seeds, int stream) const
{
int n = x_.size();
if (n > 1) {
double xi = prn();
double xi = prn(prn_seeds, stream);
double c = 0.0;
for (int i = 0; i < n; ++i) {
c += p_[i];
@ -74,9 +74,9 @@ Uniform::Uniform(pugi::xml_node node)
b_ = params.at(1);
}
double Uniform::sample() const
double Uniform::sample(uint64_t * prn_seeds, int stream) const
{
return a_ + prn()*(b_ - a_);
return a_ + prn(prn_seeds, stream)*(b_ - a_);
}
//==============================================================================
@ -88,9 +88,9 @@ Maxwell::Maxwell(pugi::xml_node node)
theta_ = std::stod(get_node_value(node, "parameters"));
}
double Maxwell::sample() const
double Maxwell::sample(uint64_t * prn_seeds, int stream) const
{
return maxwell_spectrum(theta_);
return maxwell_spectrum(theta_, prn_seeds, stream);
}
//==============================================================================
@ -108,9 +108,9 @@ Watt::Watt(pugi::xml_node node)
b_ = params.at(1);
}
double Watt::sample() const
double Watt::sample(uint64_t * prn_seeds, int stream) const
{
return watt_spectrum(a_, b_);
return watt_spectrum(a_, b_, prn_seeds, stream);
}
//==============================================================================
@ -127,9 +127,9 @@ Normal::Normal(pugi::xml_node node)
std_dev_ = params.at(1);
}
double Normal::sample() const
double Normal::sample(uint64_t * prn_seeds, int stream) const
{
return normal_variate(mean_value_, std_dev_);
return normal_variate(mean_value_, std_dev_, prn_seeds, stream);
}
//==============================================================================
@ -147,9 +147,9 @@ Muir::Muir(pugi::xml_node node)
kt_ = params.at(2);
}
double Muir::sample() const
double Muir::sample(uint64_t * prn_seeds, int stream) const
{
return muir_spectrum(e0_, m_rat_, kt_);
return muir_spectrum(e0_, m_rat_, kt_, prn_seeds, stream);
}
//==============================================================================
@ -220,10 +220,10 @@ void Tabular::init(const double* x, const double* p, std::size_t n, const double
}
}
double Tabular::sample() const
double Tabular::sample(uint64_t * prn_seeds, int stream) const
{
// Sample value of CDF
double c = prn();
double c = prn(prn_seeds, stream);
// Find first CDF bin which is above the sampled value
double c_i = c_[0];
@ -263,11 +263,11 @@ double Tabular::sample() const
// Equiprobable implementation
//==============================================================================
double Equiprobable::sample() const
double Equiprobable::sample(uint64_t * prn_seeds, int stream) const
{
std::size_t n = x_.size();
double r = prn();
double r = prn(prn_seeds, stream);
int i = std::floor((n - 1)*r);
double xl = x_[i];

7
src/distribution_angle.cpp
View file

@ -62,7 +62,8 @@ AngleDistribution::AngleDistribution(hid_t group)
}
}
double AngleDistribution::sample(double E) const
//double AngleDistribution::sample(double E) const
double AngleDistribution::sample(double E, uint64_t * prn_seeds, int stream) const
{
// Determine number of incoming energies
auto n = energy_.size();
@ -83,10 +84,10 @@ double AngleDistribution::sample(double E) const
}
// Sample between the ith and (i+1)th bin
if (r > prn()) ++i;
if (r > prn(prn_seeds, stream)) ++i;
// Sample i-th distribution
double mu = distribution_[i]->sample();
double mu = distribution_[i]->sample(prn_seeds, stream);
// Make sure mu is in range [-1,1] and return
if (std::abs(mu) > 1.0) mu = std::copysign(1.0, mu);

18
src/distribution_energy.cpp
View file

@ -146,7 +146,7 @@ ContinuousTabular::ContinuousTabular(hid_t group)
} // incoming energies
}
double ContinuousTabular::sample(double E) const
double ContinuousTabular::sample(double E, uint64_t * prn_seeds, int stream) const
{
// Read number of interpolation regions and incoming energies
bool histogram_interp;
@ -177,7 +177,7 @@ double ContinuousTabular::sample(double E) const
if (histogram_interp) {
l = i;
} else {
l = r > prn() ? i + 1 : i;
l = r > prn(prn_seeds, stream) ? i + 1 : i;
}
// Interpolation for energy E1 and EK
@ -197,7 +197,7 @@ double ContinuousTabular::sample(double E) const
// Determine outgoing energy bin
n_energy_out = distribution_[l].e_out.size();
n_discrete = distribution_[l].n_discrete;
double r1 = prn();
double r1 = prn(prn_seeds, stream);
double c_k = distribution_[l].c[0];
int k = 0;
int end = n_energy_out - 2;
@ -275,14 +275,14 @@ MaxwellEnergy::MaxwellEnergy(hid_t group)
close_dataset(dset);
}
double MaxwellEnergy::sample(double E) const
double MaxwellEnergy::sample(double E, uint64_t * prn_seeds, int stream) const
{
// Get temperature corresponding to incoming energy
double theta = theta_(E);
while (true) {
// Sample maxwell fission spectrum
double E_out = maxwell_spectrum(theta);
double E_out = maxwell_spectrum(theta, prn_seeds, stream);
// Accept energy based on restriction energy
if (E_out <= E - u_) return E_out;
@ -301,7 +301,7 @@ Evaporation::Evaporation(hid_t group)
close_dataset(dset);
}
double Evaporation::sample(double E) const
double Evaporation::sample(double E, uint64_t * prn_seeds, int stream) const
{
// Get temperature corresponding to incoming energy
double theta = theta_(E);
@ -313,7 +313,7 @@ double Evaporation::sample(double E) const
// density function
double x;
while (true) {
x = -std::log((1.0 - v*prn())*(1.0 - v*prn()));
x = -std::log((1.0 - v*prn(prn_seeds, stream))*(1.0 - v*prn(prn_seeds, stream)));
if (x <= y) break;
}
@ -338,7 +338,7 @@ WattEnergy::WattEnergy(hid_t group)
close_dataset(dset);
}
double WattEnergy::sample(double E) const
double WattEnergy::sample(double E, uint64_t * prn_seeds, int stream) const
{
// Determine Watt parameters at incident energy
double a = a_(E);
@ -346,7 +346,7 @@ double WattEnergy::sample(double E) const
while (true) {
// Sample energy-dependent Watt fission spectrum
double E_out = watt_spectrum(a, b);
double E_out = watt_spectrum(a, b, prn_seeds, stream);
// Accept energy based on restriction energy
if (E_out <= E - u_) return E_out;

14
src/distribution_multi.cpp
View file

@ -53,14 +53,14 @@ PolarAzimuthal::PolarAzimuthal(pugi::xml_node node)
}
}
Direction PolarAzimuthal::sample() const
Direction PolarAzimuthal::sample(uint64_t * prn_seeds, int stream) const
{
// Sample cosine of polar angle
double mu = mu_->sample();
double mu = mu_->sample(prn_seeds, stream);
if (mu == 1.0) return u_ref_;
// Sample azimuthal angle
double phi = phi_->sample();
double phi = phi_->sample(prn_seeds, stream);
// If the reference direction is along the z-axis, rotate the aziumthal angle
// to match spherical coordinate conventions.
@ -74,10 +74,10 @@ Direction PolarAzimuthal::sample() const
// Isotropic implementation
//==============================================================================
Direction Isotropic::sample() const
Direction Isotropic::sample(uint64_t * prn_seeds, int stream) const
{
double phi = 2.0*PI*prn();
double mu = 2.0*prn() - 1.0;
double phi = 2.0*PI*prn(prn_seeds, stream);
double mu = 2.0*prn(prn_seeds, stream) - 1.0;
return {mu, std::sqrt(1.0 - mu*mu) * std::cos(phi),
std::sqrt(1.0 - mu*mu) * std::sin(phi)};
}
@ -86,7 +86,7 @@ Direction Isotropic::sample() const
// Monodirectional implementation
//==============================================================================
Direction Monodirectional::sample() const
Direction Monodirectional::sample(uint64_t * prn_seeds, int stream) const
{
return u_ref_;
}

18
src/distribution_spatial.cpp
View file

@ -46,9 +46,9 @@ CartesianIndependent::CartesianIndependent(pugi::xml_node node)
}
}
Position CartesianIndependent::sample() const
Position CartesianIndependent::sample(uint64_t * prn_seeds, int stream) const
{
return {x_->sample(), y_->sample(), z_->sample()};
return {x_->sample(prn_seeds, stream), y_->sample(prn_seeds, stream), z_->sample(prn_seeds, stream)};
}
//==============================================================================
@ -107,11 +107,11 @@ SphericalIndependent::SphericalIndependent(pugi::xml_node node)
}
Position SphericalIndependent::sample() const
Position SphericalIndependent::sample(uint64_t * prn_seeds, int stream) const
{
double r = r_->sample();
double theta = theta_->sample();
double phi = phi_->sample();
double r = r_->sample(prn_seeds, stream);
double theta = theta_->sample(prn_seeds, stream);
double phi = phi_->sample(prn_seeds, stream);
double x = r*sin(theta)*cos(phi) + origin_.x;
double y = r*sin(theta)*sin(phi) + origin_.y;
double z = r*cos(theta) + origin_.z;
@ -135,9 +135,9 @@ SpatialBox::SpatialBox(pugi::xml_node node, bool fission)
upper_right_ = Position{params[3], params[4], params[5]};
}
Position SpatialBox::sample() const
Position SpatialBox::sample(uint64_t * prn_seeds, int stream) const
{
Position xi {prn(), prn(), prn()};
Position xi {prn(prn_seeds, stream), prn(prn_seeds, stream), prn(prn_seeds, stream)};
return lower_left_ + xi*(upper_right_ - lower_left_);
}
@ -157,7 +157,7 @@ SpatialPoint::SpatialPoint(pugi::xml_node node)
r_ = Position{params.data()};
}
Position SpatialPoint::sample() const
Position SpatialPoint::sample(uint64_t * prn_seeds, int stream) const
{
return r_;
}

10
src/eigenvalue.cpp
View file

@ -114,12 +114,16 @@ void synchronize_bank()
fatal_error("No fission sites banked on MPI rank " + std::to_string(mpi::rank));
}
// Create pseudorandom number streams
uint64_t prn_seeds[N_STREAMS]; // seeds
int stream = STREAM_TRACKING; // current RNG stream
// Make sure all processors start at the same point for random sampling. Then
// skip ahead in the sequence using the starting index in the 'global'
// fission bank for each processor.
set_particle_seed(simulation::total_gen + overall_generation());
advance_prn_seed(start);
set_particle_seed(simulation::total_gen + overall_generation(), prn_seeds);
advance_prn_seed(start, prn_seeds, stream); // TODO: What is starting stream here? Tracking? It doesn't appear to be enforced anywhere?
// Determine how many fission sites we need to sample from the source bank
// and the probability for selecting a site.
@ -154,7 +158,7 @@ void synchronize_bank()
}
// Randomly sample sites needed
if (prn() < p_sample) {
if (prn(prn_seeds, stream) < p_sample) {
temp_sites[index_temp] = site;
++index_temp;
}

34
src/math_functions.cpp
View file

@ -630,22 +630,22 @@ void calc_zn_rad(int n, double rho, double zn_rad[]) {
}
void rotate_angle_c(double uvw[3], double mu, const double* phi) {
Direction u = rotate_angle({uvw}, mu, phi);
void rotate_angle_c(double uvw[3], double mu, const double* phi, uint64_t * prn_seeds, int stream) {
Direction u = rotate_angle({uvw}, mu, phi, prn_seeds, stream);
uvw[0] = u.x;
uvw[1] = u.y;
uvw[2] = u.z;
}
Direction rotate_angle(Direction u, double mu, const double* phi)
Direction rotate_angle(Direction u, double mu, const double* phi, uint64_t * prn_seeds, int stream)
{
// Sample azimuthal angle in [0,2pi) if none provided
double phi_;
if (phi != nullptr) {
phi_ = (*phi);
} else {
phi_ = 2.0*PI*prn();
phi_ = 2.0*PI*prn(prn_seeds, stream);
}
// Precompute factors to save flops
@ -675,11 +675,11 @@ Direction rotate_angle(Direction u, double mu, const double* phi)
}
double maxwell_spectrum(double T) {
double maxwell_spectrum(double T, uint64_t * prn_seeds, int stream) {
// Set the random numbers
double r1 = prn();
double r2 = prn();
double r3 = prn();
double r1 = prn(prn_seeds, stream);
double r2 = prn(prn_seeds, stream);
double r3 = prn(prn_seeds, stream);
// determine cosine of pi/2*r
double c = std::cos(PI / 2. * r3);
@ -691,33 +691,33 @@ double maxwell_spectrum(double T) {
}
double normal_variate(double mean, double standard_deviation) {
double normal_variate(double mean, double standard_deviation, uint64_t * prn_seeds, int stream) {
// perhaps there should be a limit to the number of resamples
while ( true ) {
double v1 = 2 * prn() - 1.;
double v2 = 2 * prn() - 1.;
double v1 = 2 * prn(prn_seeds, stream) - 1.;
double v2 = 2 * prn(prn_seeds, stream) - 1.;
double r = std::pow(v1, 2) + std::pow(v2, 2);
double r2 = std::pow(r, 2);
if (r2 < 1) {
double z = std::sqrt(-2.0 * std::log(r2)/r2);
z *= (prn() <= 0.5) ? v1 : v2;
z *= (prn(prn_seeds, stream) <= 0.5) ? v1 : v2;
return mean + standard_deviation*z;
}
}
}
double muir_spectrum(double e0, double m_rat, double kt) {
double muir_spectrum(double e0, double m_rat, double kt, uint64_t * prn_seeds, int stream) {
// note sigma here is a factor of 2 shy of equation
// 8 in https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-05411-MS
double sigma = std::sqrt(2.*e0*kt/m_rat);
return normal_variate(e0, sigma);
return normal_variate(e0, sigma, prn_seeds, stream);
}
double watt_spectrum(double a, double b) {
double w = maxwell_spectrum(a);
double E_out = w + 0.25 * a * a * b + (2. * prn() - 1.) * std::sqrt(a * a * b * w);
double watt_spectrum(double a, double b, uint64_t * prn_seeds, int stream) {
double w = maxwell_spectrum(a, prn_seeds, stream);
double E_out = w + 0.25 * a * a * b + (2. * prn(prn_seeds, stream) - 1.) * std::sqrt(a * a * b * w);
return E_out;
}

11
src/mgxs.cpp
View file

@ -529,7 +529,7 @@ Mgxs::get_xs(int xstype, int gin, const int* gout, const double* mu,
//==============================================================================
void
Mgxs::sample_fission_energy(int gin, int& dg, int& gout)
Mgxs::sample_fission_energy(int gin, int& dg, int& gout, uint64_t * prn_seeds, int stream)
{
// This method assumes that the temperature and angle indices are set
#ifdef _OPENMP
@ -544,8 +544,8 @@ Mgxs::sample_fission_energy(int gin, int& dg, int& gout)
double prob_prompt = xs_t->prompt_nu_fission(cache[tid].a, gin);
// sample random numbers
double xi_pd = prn() * nu_fission;
double xi_gout = prn();
double xi_pd = prn(prn_seeds, stream) * nu_fission;
double xi_gout = prn(prn_seeds, stream);
// Select whether the neutron is prompt or delayed
if (xi_pd <= prob_prompt) {
@ -585,7 +585,8 @@ Mgxs::sample_fission_energy(int gin, int& dg, int& gout)
//==============================================================================
void
Mgxs::sample_scatter(int gin, int& gout, double& mu, double& wgt)
Mgxs::sample_scatter(int gin, int& gout, double& mu, double& wgt, uint64_t * prn_seeds,
int stream)
{
// This method assumes that the temperature and angle indices are set
// Sample the data
@ -594,7 +595,7 @@ Mgxs::sample_scatter(int gin, int& gout, double& mu, double& wgt)
#else
int tid = 0;
#endif
xs[cache[tid].t].scatter[cache[tid].a]->sample(gin, gout, mu, wgt);
xs[cache[tid].t].scatter[cache[tid].a]->sample(gin, gout, mu, wgt, prn_seeds, stream);
}
//==============================================================================

8
src/nuclide.cpp
View file

@ -581,7 +581,7 @@ void Nuclide::calculate_xs(int i_sab, int i_log_union, double sab_frac, Particle
// Randomly sample between temperature i and i+1
f = (kT - kTs_[i_temp]) / (kTs_[i_temp + 1] - kTs_[i_temp]);
if (f > prn()) ++i_temp;
if (f > prn(p.prn_seeds, p.stream)) ++i_temp;
break;
}
@ -756,11 +756,11 @@ void Nuclide::calculate_urr_xs(int i_temp, Particle& p) const
// This guarantees the randomness and, at the same time, makes sure we
// reuse random numbers for the same nuclide at different temperatures,
// therefore preserving correlation of temperature in probability tables.
prn_set_stream(STREAM_URR_PTABLE);
p.stream = STREAM_URR_PTABLE;
//TODO: to maintain the same random number stream as the Fortran code this
//replaces, the seed is set with i_nuclide_ + 1 instead of i_nuclide_
double r = future_prn(static_cast<int64_t>(i_nuclide_ + 1));
prn_set_stream(STREAM_TRACKING);
double r = future_prn(static_cast<int64_t>(i_nuclide_ + 1), p.prn_seeds, p.stream);
p.stream = STREAM_TRACKING;
int i_low = 0;
while (urr.prob_(i_energy, URR_CUM_PROB, i_low) <= r) {++i_low;};

6
src/particle.cpp
View file

@ -157,9 +157,9 @@ Particle::transport()
while (true) {
// Set the random number stream
if (type_ == Particle::Type::neutron) {
prn_set_stream(STREAM_TRACKING);
stream = STREAM_TRACKING;
} else {
prn_set_stream(STREAM_PHOTON);
stream = STREAM_PHOTON;
}
// Store pre-collision particle properties
@ -228,7 +228,7 @@ Particle::transport()
} else if (macro_xs_.total == 0.0) {
d_collision = INFINITY;
} else {
d_collision = -std::log(prn()) / macro_xs_.total;
d_collision = -std::log(prn(prn_seeds, stream)) / macro_xs_.total;
}
// Select smaller of the two distances

69
src/photon.cpp
View file

@ -290,12 +290,12 @@ PhotonInteraction::PhotonInteraction(hid_t group, int i_element)
}
void PhotonInteraction::compton_scatter(double alpha, bool doppler,
double* alpha_out, double* mu, int* i_shell) const
double* alpha_out, double* mu, int* i_shell, uint64_t * prn_seeds, int stream) const
{
double form_factor_xmax = 0.0;
while (true) {
// Sample Klein-Nishina distribution for trial energy and angle
std::tie(*alpha_out, *mu) = klein_nishina(alpha);
std::tie(*alpha_out, *mu) = klein_nishina(alpha, prn_seeds, stream);
// Note that the parameter used here does not correspond exactly to the
// momentum transfer q in ENDF-102 Eq. (27.2). Rather, this is the
@ -309,10 +309,10 @@ void PhotonInteraction::compton_scatter(double alpha, bool doppler,
}
// Perform rejection on form factor
if (prn() < form_factor_x / form_factor_xmax) {
if (prn(prn_seeds, stream) < form_factor_x / form_factor_xmax) {
if (doppler) {
double E_out;
this->compton_doppler(alpha, *mu, &E_out, i_shell);
this->compton_doppler(alpha, *mu, &E_out, i_shell, prn_seeds, stream);
*alpha_out = E_out/MASS_ELECTRON_EV;
} else {
*i_shell = -1;
@ -323,14 +323,14 @@ void PhotonInteraction::compton_scatter(double alpha, bool doppler,
}
void PhotonInteraction::compton_doppler(double alpha, double mu,
double* E_out, int* i_shell) const
double* E_out, int* i_shell, uint64_t * prn_seeds, int stream) const
{
auto n = data::compton_profile_pz.size();
int shell; // index for shell
while (true) {
// Sample electron shell
double rn = prn();
double rn = prn(prn_seeds, stream);
double c = 0.0;
for (shell = 0; shell < electron_pdf_.size(); ++shell) {
c += electron_pdf_(shell);
@ -377,7 +377,7 @@ void PhotonInteraction::compton_doppler(double alpha, double mu,
}
// Sample value on bounded cdf
c = prn()*c_max;
c = prn(prn_seeds, stream)*c_max;
// Determine pz corresponding to sampled cdf value
auto cdf_shell = xt::view(profile_cdf_, shell, xt::all());
@ -418,7 +418,7 @@ void PhotonInteraction::compton_doppler(double alpha, double mu,
if (E_out1 > 0.0) {
if (E_out2 > 0.0) {
// If both are positive, pick one at random
*E_out = prn() < 0.5 ? E_out1 : E_out2;
*E_out = prn(prn_seeds, stream) < 0.5 ? E_out1 : E_out2;
} else {
*E_out = E_out1;
}
@ -496,7 +496,7 @@ void PhotonInteraction::calculate_xs(Particle& p) const
xs.last_E = p.E_;
}
double PhotonInteraction::rayleigh_scatter(double alpha) const
double PhotonInteraction::rayleigh_scatter(double alpha, uint64_t * prn_seeds, int stream) const
{
double mu;
while (true) {
@ -507,7 +507,7 @@ double PhotonInteraction::rayleigh_scatter(double alpha) const
double F_max = coherent_int_form_factor_(x2_max);
// Sample cumulative distribution
double F = prn()*F_max;
double F = prn(prn_seeds, stream)*F_max;
// Determine x^2 corresponding to F
const auto& x {coherent_int_form_factor_.x()};
@ -519,13 +519,14 @@ double PhotonInteraction::rayleigh_scatter(double alpha) const
// Calculate mu
mu = 1.0 - 2.0*x2/x2_max;
if (prn() < 0.5*(1.0 + mu*mu)) break;
if (prn(prn_seeds, stream) < 0.5*(1.0 + mu*mu)) break;
}
return mu;
}
void PhotonInteraction::pair_production(double alpha, double* E_electron,
double* E_positron, double* mu_electron, double* mu_positron) const
double* E_positron, double* mu_electron, double* mu_positron, uint64_t * prn_seeds,
int stream) const
{
constexpr double r[] {
122.81, 73.167, 69.228, 67.301, 64.696, 61.228,
@ -592,12 +593,12 @@ void PhotonInteraction::pair_production(double alpha, double* E_electron,
double u2 = phi2_max;
double e;
while (true) {
double rn = prn();
double rn = prn(prn_seeds, stream);
// Sample the index i in (1, 2) using the point probabilities
// p(1) = u_1/(u_1 + u_2) and p(2) = u_2/(u_1 + u_2)
int i;
if (prn() < u1/(u1 + u2)) {
if (prn(prn_seeds, stream) < u1/(u1 + u2)) {
i = 1;
// Sample e from pi_1 using the inverse transform method
@ -618,10 +619,10 @@ void PhotonInteraction::pair_production(double alpha, double* E_electron,
t3 = b*b*(4.0 - 4.0*t2 - 3.0*std::log(1.0 + 1.0/(b*b)));
if (i == 1) {
double phi1 = 7.0/3.0 - t1 - 6.0*t2 - t3 + t4;
if (prn() <= phi1/phi1_max) break;
if (prn(prn_seeds, stream) <= phi1/phi1_max) break;
} else {
double phi2 = 11.0/6.0 - t1 - 3.0*t2 + 0.5*t3 + t4;
if (prn() <= phi2/phi2_max) break;
if (prn(prn_seeds, stream) <= phi2/phi2_max) break;
}
}
@ -634,13 +635,13 @@ void PhotonInteraction::pair_production(double alpha, double* E_electron,
// p(mu) = C/(1 - beta*mu)^2 using the inverse transform method.
double beta = std::sqrt(*E_electron*(*E_electron + 2.0*MASS_ELECTRON_EV))
/ (*E_electron + MASS_ELECTRON_EV) ;
double rn = 2.0*prn() - 1.0;
double rn = 2.0*prn(prn_seeds, stream) - 1.0;
*mu_electron = (rn + beta)/(rn*beta + 1.0);
// Sample the scattering angle of the positron
beta = std::sqrt(*E_positron*(*E_positron + 2.0*MASS_ELECTRON_EV))
/ (*E_positron + MASS_ELECTRON_EV);
rn = 2.0*prn() - 1.0;
rn = 2.0*prn(prn_seeds, stream) - 1.0;
*mu_positron = (rn + beta)/(rn*beta + 1.0);
}
@ -648,8 +649,8 @@ void PhotonInteraction::atomic_relaxation(const ElectronSubshell& shell, Particl
{
// If no transitions, assume fluorescent photon from captured free electron
if (shell.n_transitions == 0) {
double mu = 2.0*prn() - 1.0;
double phi = 2.0*PI*prn();
double mu = 2.0*prn(p.prn_seeds, p.stream) - 1.0;
double phi = 2.0*PI*prn(p.prn_seeds, p.stream);
Direction u;
u.x = mu;
u.y = std::sqrt(1.0 - mu*mu)*std::cos(phi);
@ -660,7 +661,7 @@ void PhotonInteraction::atomic_relaxation(const ElectronSubshell& shell, Particl
}
// Sample transition
double rn = prn();
double rn = prn(p.prn_seeds, p.stream);
double c = 0.0;
int i_transition;
for (i_transition = 0; i_transition < shell.n_transitions; ++i_transition) {
@ -673,8 +674,8 @@ void PhotonInteraction::atomic_relaxation(const ElectronSubshell& shell, Particl
int secondary = shell.transition_subshells(i_transition, 1);
// Sample angle isotropically
double mu = 2.0*prn() - 1.0;
double phi = 2.0*PI*prn();
double mu = 2.0*prn(p.prn_seeds, p.stream) - 1.0;
double phi = 2.0*PI*prn(p.prn_seeds, p.stream);
Direction u;
u.x = mu;
u.y = std::sqrt(1.0 - mu*mu)*std::cos(phi);
@ -710,7 +711,7 @@ void PhotonInteraction::atomic_relaxation(const ElectronSubshell& shell, Particl
// Non-member functions
//==============================================================================
std::pair<double, double> klein_nishina(double alpha)
std::pair<double, double> klein_nishina(double alpha, uint64_t * prn_seeds, int stream)
{
double alpha_out, mu;
double beta = 1.0 + 2.0*alpha;
@ -719,19 +720,19 @@ std::pair<double, double> klein_nishina(double alpha)
double t = beta/(beta + 8.0);
double x;
while (true) {
if (prn() < t) {
if (prn(prn_seeds, stream) < t) {
// Left branch of flow chart
double r = 2.0*prn();
double r = 2.0*prn(prn_seeds, stream);
x = 1.0 + alpha*r;
if (prn() < 4.0/x*(1.0 - 1.0/x)) {
if (prn(prn_seeds, stream) < 4.0/x*(1.0 - 1.0/x)) {
mu = 1 - r;
break;
}
} else {
// Right branch of flow chart
x = beta/(1.0 + 2.0*alpha*prn());
x = beta/(1.0 + 2.0*alpha*prn(prn_seeds, stream));
mu = 1.0 + (1.0 - x)/alpha;
if (prn() < 0.5*(mu*mu + 1.0/x)) break;
if (prn(prn_seeds, stream) < 0.5*(mu*mu + 1.0/x)) break;
}
}
alpha_out = alpha/x;
@ -739,24 +740,24 @@ std::pair<double, double> klein_nishina(double alpha)
} else {
// Koblinger's direct method
double gamma = 1.0 - std::pow(beta, -2);
double s = prn()*(4.0/alpha + 0.5*gamma +
double s = prn(prn_seeds, stream)*(4.0/alpha + 0.5*gamma +
(1.0 - (1.0 + beta)/(alpha*alpha))*std::log(beta));
if (s <= 2.0/alpha) {
// For first term, x = 1 + 2ar
// Therefore, a' = a/(1 + 2ar)
alpha_out = alpha/(1.0 + 2.0*alpha*prn());
alpha_out = alpha/(1.0 + 2.0*alpha*prn(prn_seeds, stream));
} else if (s <= 4.0/alpha) {
// For third term, x = beta/(1 + 2ar)
// Therefore, a' = a(1 + 2ar)/beta
alpha_out = alpha*(1.0 + 2.0*alpha*prn())/beta;
alpha_out = alpha*(1.0 + 2.0*alpha*prn(prn_seeds, stream))/beta;
} else if (s <= 4.0/alpha + 0.5*gamma) {
// For fourth term, x = 1/sqrt(1 - gamma*r)
// Therefore, a' = a*sqrt(1 - gamma*r)
alpha_out = alpha*std::sqrt(1.0 - gamma*prn());
alpha_out = alpha*std::sqrt(1.0 - gamma*prn(prn_seeds, stream));
} else {
// For third term, x = beta^r
// Therefore, a' = a/beta^r
alpha_out = alpha/std::pow(beta, prn());
alpha_out = alpha/std::pow(beta, prn(prn_seeds, stream));
}
// Calculate cosine of scattering angle based on basic relation

128
src/physics.cpp
View file

@ -112,9 +112,9 @@ void sample_neutron_reaction(Particle* p)
// Create secondary photons
if (settings::photon_transport) {
prn_set_stream(STREAM_PHOTON);
p->stream = STREAM_PHOTON;
sample_secondary_photons(p, i_nuclide);
prn_set_stream(STREAM_TRACKING);
p->stream = STREAM_TRACKING;
}
// If survival biasing is being used, the following subroutine adjusts the
@ -133,9 +133,9 @@ void sample_neutron_reaction(Particle* p)
// Advance URR seed stream 'N' times after energy changes
if (p->E_ != p->E_last_) {
prn_set_stream(STREAM_URR_PTABLE);
advance_prn_seed(data::nuclides.size());
prn_set_stream(STREAM_TRACKING);
p->stream = STREAM_URR_PTABLE;
advance_prn_seed(data::nuclides.size(), p->prn_seeds, p->stream);
p->stream = STREAM_TRACKING;
}
// Play russian roulette if survival biasing is turned on
@ -159,7 +159,7 @@ create_fission_sites(Particle* p, int i_nuclide, const Reaction* rx,
// Sample the number of neutrons produced
int nu = static_cast<int>(nu_t);
if (prn() <= (nu_t - nu)) ++nu;
if (prn(p->prn_seeds, p->stream) <= (nu_t - nu)) ++nu;
// Begin banking the source neutrons
// First, if our bank is full then don't continue
@ -181,7 +181,7 @@ create_fission_sites(Particle* p, int i_nuclide, const Reaction* rx,
site.wgt = 1. / weight;
// Sample delayed group and angle/energy for fission reaction
sample_fission_neutron(i_nuclide, rx, p->E_, &site);
sample_fission_neutron(i_nuclide, rx, p->E_, &site, p->prn_seeds, p->stream);
// Set the delayed group on the particle as well
p->delayed_group_ = site.delayed_group;
@ -223,13 +223,13 @@ void sample_photon_reaction(Particle* p)
// For tallying purposes, this routine might be called directly. In that
// case, we need to sample a reaction via the cutoff variable
double prob = 0.0;
double cutoff = prn() * micro.total;
double cutoff = prn(p->prn_seeds, p->stream) * micro.total;
// Coherent (Rayleigh) scattering
prob += micro.coherent;
if (prob > cutoff) {
double mu = element.rayleigh_scatter(alpha);
p->u() = rotate_angle(p->u(), mu, nullptr);
double mu = element.rayleigh_scatter(alpha, p->prn_seeds, p->stream);
p->u() = rotate_angle(p->u(), mu, nullptr, p->prn_seeds, p->stream);
p->event_ = EVENT_SCATTER;
p->event_mt_ = COHERENT;
return;
@ -240,7 +240,7 @@ void sample_photon_reaction(Particle* p)
if (prob > cutoff) {
double alpha_out, mu;
int i_shell;
element.compton_scatter(alpha, true, &alpha_out, &mu, &i_shell);
element.compton_scatter(alpha, true, &alpha_out, &mu, &i_shell, p->prn_seeds, p->stream);
// Determine binding energy of shell. The binding energy is 0.0 if
// doppler broadening is not used.
@ -252,13 +252,13 @@ void sample_photon_reaction(Particle* p)
}
// Create Compton electron
double phi = 2.0*PI*prn();
double phi = 2.0*PI*prn(p->prn_seeds, p->stream);
double E_electron = (alpha - alpha_out)*MASS_ELECTRON_EV - e_b;
int electron = static_cast<int>(Particle::Type::electron);
if (E_electron >= settings::energy_cutoff[electron]) {
double mu_electron = (alpha - alpha_out*mu)
/ std::sqrt(alpha*alpha + alpha_out*alpha_out - 2.0*alpha*alpha_out*mu);
Direction u = rotate_angle(p->u(), mu_electron, &phi);
Direction u = rotate_angle(p->u(), mu_electron, &phi, p->prn_seeds, p->stream);
p->create_secondary(u, E_electron, Particle::Type::electron);
}
@ -272,7 +272,7 @@ void sample_photon_reaction(Particle* p)
phi += PI;
p->E_ = alpha_out*MASS_ELECTRON_EV;
p->u() = rotate_angle(p->u(), mu, &phi);
p->u() = rotate_angle(p->u(), mu, &phi, p->prn_seeds, p->stream);
p->event_ = EVENT_SCATTER;
p->event_mt_ = INCOHERENT;
return;
@ -304,8 +304,8 @@ void sample_photon_reaction(Particle* p)
// model in Serpent 2" by Toni Kaltiaisenaho
double mu;
while (true) {
double r = prn();
if (4.0*(1.0 - r)*r >= prn()) {
double r = prn(p->prn_seeds, p->stream);
if (4.0*(1.0 - r)*r >= prn(p->prn_seeds, p->stream)) {
double rel_vel = std::sqrt(E_electron * (E_electron +
2.0*MASS_ELECTRON_EV)) / (E_electron + MASS_ELECTRON_EV);
mu = (2.0*r + rel_vel - 1.0) / (2.0*rel_vel*r - rel_vel + 1.0);
@ -313,7 +313,7 @@ void sample_photon_reaction(Particle* p)
}
}
double phi = 2.0*PI*prn();
double phi = 2.0*PI*prn(p->prn_seeds, p->stream);
Direction u;
u.x = mu;
u.y = std::sqrt(1.0 - mu*mu)*std::cos(phi);
@ -341,14 +341,14 @@ void sample_photon_reaction(Particle* p)
double E_electron, E_positron;
double mu_electron, mu_positron;
element.pair_production(alpha, &E_electron, &E_positron,
&mu_electron, &mu_positron);
&mu_electron, &mu_positron, p->prn_seeds, p->stream);
// Create secondary electron
Direction u = rotate_angle(p->u(), mu_electron, nullptr);
Direction u = rotate_angle(p->u(), mu_electron, nullptr, p->prn_seeds, p->stream);
p->create_secondary(u, E_electron, Particle::Type::electron);
// Create secondary positron
u = rotate_angle(p->u(), mu_positron, nullptr);
u = rotate_angle(p->u(), mu_positron, nullptr, p->prn_seeds, p->stream);
p->create_secondary(u, E_positron, Particle::Type::positron);
p->event_ = EVENT_ABSORB;
@ -382,8 +382,8 @@ void sample_positron_reaction(Particle* p)
}
// Sample angle isotropically
double mu = 2.0*prn() - 1.0;
double phi = 2.0*PI*prn();
double mu = 2.0*prn(p->prn_seeds, p->stream) - 1.0;
double phi = 2.0*PI*prn(p->prn_seeds, p->stream);
Direction u;
u.x = mu;
u.y = std::sqrt(1.0 - mu*mu)*std::cos(phi);
@ -401,7 +401,7 @@ void sample_positron_reaction(Particle* p)
int sample_nuclide(const Particle* p)
{
// Sample cumulative distribution function
double cutoff = prn() * p->macro_xs_.total;
double cutoff = prn(p->prn_seeds, p->stream) * p->macro_xs_.total;
// Get pointers to nuclide/density arrays
const auto& mat {model::materials[p->material_]};
@ -426,7 +426,7 @@ int sample_nuclide(const Particle* p)
int sample_element(Particle* p)
{
// Sample cumulative distribution function
double cutoff = prn() * p->macro_xs_.total;
double cutoff = prn(p->prn_seeds, p->stream) * p->macro_xs_.total;
// Get pointers to elements, densities
const auto& mat {model::materials[p->material_]};
@ -479,7 +479,7 @@ Reaction* sample_fission(int i_nuclide, const Particle* p)
int i_temp = p->neutron_xs_[i_nuclide].index_temp;
int i_grid = p->neutron_xs_[i_nuclide].index_grid;
double f = p->neutron_xs_[i_nuclide].interp_factor;
double cutoff = prn() * p->neutron_xs_[i_nuclide].fission;
double cutoff = prn(p->prn_seeds, p->stream) * p->neutron_xs_[i_nuclide].fission;
double prob = 0.0;
// Loop through each partial fission reaction type
@ -506,7 +506,7 @@ void sample_photon_product(int i_nuclide, const Particle* p, int* i_rx, int* i_p
int i_temp = p->neutron_xs_[i_nuclide].index_temp;
int i_grid = p->neutron_xs_[i_nuclide].index_grid;
double f = p->neutron_xs_[i_nuclide].interp_factor;
double cutoff = prn() * p->neutron_xs_[i_nuclide].photon_prod;
double cutoff = prn(p->prn_seeds, p->stream) * p->neutron_xs_[i_nuclide].photon_prod;
double prob = 0.0;
// Loop through each reaction type
@ -554,7 +554,7 @@ void absorption(Particle* p, int i_nuclide)
} else {
// See if disappearance reaction happens
if (p->neutron_xs_[i_nuclide].absorption >
prn() * p->neutron_xs_[i_nuclide].total) {
prn(p->prn_seeds, p->stream) * p->neutron_xs_[i_nuclide].total) {
// Score absorption estimate of keff
if (settings::run_mode == RUN_MODE_EIGENVALUE) {
global_tally_absorption += p->wgt_ * p->neutron_xs_[
@ -582,7 +582,7 @@ void scatter(Particle* p, int i_nuclide)
// For tallying purposes, this routine might be called directly. In that
// case, we need to sample a reaction via the cutoff variable
double cutoff = prn() * (micro.total - micro.absorption);
double cutoff = prn(p->prn_seeds, p->stream) * (micro.total - micro.absorption);
bool sampled = false;
// Calculate elastic cross section if it wasn't precalculated
@ -656,8 +656,8 @@ void scatter(Particle* p, int i_nuclide)
int i_nuc_mat = mat->mat_nuclide_index_[i_nuclide];
if (mat->p0_[i_nuc_mat]) {
// Sample isotropic-in-lab outgoing direction
double mu = 2.0*prn() - 1.0;
double phi = 2.0*PI*prn();
double mu = 2.0*prn(p->prn_seeds, p->stream) - 1.0;
double phi = 2.0*PI*prn(p->prn_seeds, p->stream);
// Change direction of particle
p->u().x = mu;
@ -684,7 +684,7 @@ void elastic_scatter(int i_nuclide, const Reaction& rx, double kT,
Direction v_t {};
if (!p->neutron_xs_[i_nuclide].use_ptable) {
v_t = sample_target_velocity(nuc.get(), p->E_, p->u(), v_n,
p->neutron_xs_[i_nuclide].elastic, kT);
p->neutron_xs_[i_nuclide].elastic, kT, p->prn_seeds, p->stream);
}
// Velocity of center-of-mass
@ -702,9 +702,9 @@ void elastic_scatter(int i_nuclide, const Reaction& rx, double kT,
auto& d = rx.products_[0].distribution_[0];
auto d_ = dynamic_cast<UncorrelatedAngleEnergy*>(d.get());
if (d_) {
mu_cm = d_->angle().sample(p->E_);
mu_cm = d_->angle().sample(p->E_, p->prn_seeds, p->stream);
} else {
mu_cm = 2.0*prn() - 1.0;
mu_cm = 2.0*prn(p->prn_seeds, p->stream) - 1.0;
}
// Determine direction cosines in CM
@ -713,7 +713,7 @@ void elastic_scatter(int i_nuclide, const Reaction& rx, double kT,
// Rotate neutron velocity vector to new angle -- note that the speed of the
// neutron in CM does not change in elastic scattering. However, the speed
// will change when we convert back to LAB
v_n = vel * rotate_angle(u_cm, mu_cm, nullptr);
v_n = vel * rotate_angle(u_cm, mu_cm, nullptr, p->prn_seeds, p->stream);
// Transform back to LAB frame
v_n += v_cm;
@ -742,15 +742,15 @@ void sab_scatter(int i_nuclide, int i_sab, Particle* p)
// Sample energy and angle
double E_out;
data::thermal_scatt[i_sab]->data_[i_temp].sample(micro, p->E_, &E_out, &p->mu_);
data::thermal_scatt[i_sab]->data_[i_temp].sample(micro, p->E_, &E_out, &p->mu_, p->prn_seeds, p->stream);
// Set energy to outgoing, change direction of particle
p->E_ = E_out;
p->u() = rotate_angle(p->u(), p->mu_, nullptr);
p->u() = rotate_angle(p->u(), p->mu_, nullptr, p->prn_seeds, p->stream);
}
Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
Direction v_neut, double xs_eff, double kT)
Direction v_neut, double xs_eff, double kT, uint64_t * prn_seeds, int stream)
{
// check if nuclide is a resonant scatterer
ResScatMethod sampling_method;
@ -782,7 +782,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
case ResScatMethod::cxs:
// sample target velocity with the constant cross section (cxs) approx.
return sample_cxs_target_velocity(nuc->awr_, E, u, kT);
return sample_cxs_target_velocity(nuc->awr_, E, u, kT, prn_seeds, stream);
case ResScatMethod::dbrc:
case ResScatMethod::rvs: {
@ -816,7 +816,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
if (i_E_up == i_E_low) {
// Handle degenerate case -- if the upper/lower bounds occur for the same
// index, then using cxs is probably a good approximation
return sample_cxs_target_velocity(nuc->awr_, E, u, kT);
return sample_cxs_target_velocity(nuc->awr_, E, u, kT, prn_seeds, stream);
}
if (sampling_method == ResScatMethod::dbrc) {
@ -840,7 +840,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
Direction v_target;
while (true) {
// sample target velocity with the constant cross section (cxs) approx.
v_target = sample_cxs_target_velocity(nuc->awr_, E, u, kT);
v_target = sample_cxs_target_velocity(nuc->awr_, E, u, kT, prn_seeds, stream);
Direction v_rel = v_neut - v_target;
E_rel = v_rel.dot(v_rel);
if (E_rel < E_up) break;
@ -849,7 +849,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
// perform Doppler broadening rejection correction (dbrc)
double xs_0K = nuc->elastic_xs_0K(E_rel);
double R = xs_0K / xs_max;
if (prn() < R) return v_target;
if (prn(prn_seeds, stream) < R) return v_target;
}
} else if (sampling_method == ResScatMethod::rvs) {
@ -869,10 +869,10 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
while (true) {
// directly sample Maxwellian
double E_t = -kT * std::log(prn());
double E_t = -kT * std::log(prn(prn_seeds, stream));
// sample a relative energy using the xs cdf
double cdf_rel = cdf_low + prn()*(cdf_up - cdf_low);
double cdf_rel = cdf_low + prn(prn_seeds, stream)*(cdf_up - cdf_low);
int i_E_rel = lower_bound_index(&nuc->xs_cdf_[i_E_low-1],
&nuc->xs_cdf_[i_E_up+1], cdf_rel);
double E_rel = nuc->energy_0K_[i_E_low + i_E_rel];
@ -890,7 +890,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
if (std::abs(mu) < 1.0) {
// set and accept target velocity
E_t /= nuc->awr_;
return std::sqrt(E_t) * rotate_angle(u, mu, nullptr);
return std::sqrt(E_t) * rotate_angle(u, mu, nullptr, prn_seeds, stream);
}
}
}
@ -901,7 +901,7 @@ Direction sample_target_velocity(const Nuclide* nuc, double E, Direction u,
}
Direction
sample_cxs_target_velocity(double awr, double E, Direction u, double kT)
sample_cxs_target_velocity(double awr, double E, Direction u, double kT, uint64_t * prn_seeds, int stream)
{
double beta_vn = std::sqrt(awr * E / kT);
double alpha = 1.0/(1.0 + std::sqrt(PI)*beta_vn/2.0);
@ -910,10 +910,10 @@ sample_cxs_target_velocity(double awr, double E, Direction u, double kT)
double mu;
while (true) {
// Sample two random numbers
double r1 = prn();
double r2 = prn();
double r1 = prn(prn_seeds, stream);
double r2 = prn(prn_seeds, stream);
if (prn() < alpha) {
if (prn(prn_seeds, stream) < alpha) {
// With probability alpha, we sample the distribution p(y) =
// y*e^(-y). This can be done with sampling scheme C45 frmo the Monte
// Carlo sampler
@ -925,7 +925,7 @@ sample_cxs_target_velocity(double awr, double E, Direction u, double kT)
// e^(-y^2). This can be done with sampling scheme C61 from the Monte
// Carlo sampler
double c = std::cos(PI/2.0 * prn());
double c = std::cos(PI/2.0 * prn(prn_seeds, stream));
beta_vt_sq = -std::log(r1) - std::log(r2)*c*c;
}
@ -933,14 +933,14 @@ sample_cxs_target_velocity(double awr, double E, Direction u, double kT)
double beta_vt = std::sqrt(beta_vt_sq);
// Sample cosine of angle between neutron and target velocity
mu = 2.0*prn() - 1.0;
mu = 2.0*prn(prn_seeds, stream) - 1.0;
// Determine rejection probability
double accept_prob = std::sqrt(beta_vn*beta_vn + beta_vt_sq -
2*beta_vn*beta_vt*mu) / (beta_vn + beta_vt);
// Perform rejection sampling on vt and mu
if (prn() < accept_prob) break;
if (prn(prn_seeds, stream) < accept_prob) break;
}
// Determine speed of target nucleus
@ -948,19 +948,19 @@ sample_cxs_target_velocity(double awr, double E, Direction u, double kT)
// Determine velocity vector of target nucleus based on neutron's velocity
// and the sampled angle between them
return vt * rotate_angle(u, mu, nullptr);
return vt * rotate_angle(u, mu, nullptr, prn_seeds, stream);
}
void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Particle::Bank* site)
void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Particle::Bank* site, uint64_t * prn_seeds, int stream)
{
// Sample cosine of angle -- fission neutrons are always emitted
// isotropically. Sometimes in ACE data, fission reactions actually have
// an angular distribution listed, but for those that do, it's simply just
// a uniform distribution in mu
double mu = 2.0 * prn() - 1.0;
double mu = 2.0 * prn(prn_seeds, stream) - 1.0;
// Sample azimuthal angle uniformly in [0,2*pi)
double phi = 2.0*PI*prn();
double phi = 2.0*PI*prn(prn_seeds, stream);
site->u.x = mu;
site->u.y = std::sqrt(1.0 - mu*mu) * std::cos(phi);
site->u.z = std::sqrt(1.0 - mu*mu) * std::sin(phi);
@ -971,12 +971,12 @@ void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Part
double nu_d = nuc->nu(E_in, Nuclide::EmissionMode::delayed);
double beta = nu_d / nu_t;
if (prn() < beta) {
if (prn(prn_seeds, stream) < beta) {
// ====================================================================
// DELAYED NEUTRON SAMPLED
// sampled delayed precursor group
double xi = prn()*nu_d;
double xi = prn(prn_seeds, stream)*nu_d;
double prob = 0.0;
int group;
for (group = 1; group < nuc->n_precursor_; ++group) {
@ -1000,7 +1000,7 @@ void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Part
while (true) {
// sample from energy/angle distribution -- note that mu has already been
// sampled above and doesn't need to be resampled
rx->products_[group].sample(E_in, site->E, mu);
rx->products_[group].sample(E_in, site->E, mu, prn_seeds, stream);
// resample if energy is greater than maximum neutron energy
constexpr int neutron = static_cast<int>(Particle::Type::neutron);
@ -1025,7 +1025,7 @@ void sample_fission_neutron(int i_nuclide, const Reaction* rx, double E_in, Part
// sample from prompt neutron energy distribution
int n_sample = 0;
while (true) {
rx->products_[0].sample(E_in, site->E, mu);
rx->products_[0].sample(E_in, site->E, mu, prn_seeds, stream);
// resample if energy is greater than maximum neutron energy
constexpr int neutron = static_cast<int>(Particle::Type::neutron);
@ -1050,7 +1050,7 @@ void inelastic_scatter(const Nuclide* nuc, const Reaction* rx, Particle* p)
// sample outgoing energy and scattering cosine
double E;
double mu;
rx->products_[0].sample(E_in, E, mu);
rx->products_[0].sample(E_in, E, mu, p->prn_seeds, p->stream);
// if scattering system is in center-of-mass, transfer cosine of scattering
// angle and outgoing energy from CM to LAB
@ -1076,7 +1076,7 @@ void inelastic_scatter(const Nuclide* nuc, const Reaction* rx, Particle* p)
p->mu_ = mu;
// change direction of particle
p->u() = rotate_angle(p->u(), mu, nullptr);
p->u() = rotate_angle(p->u(), mu, nullptr, p->prn_seeds, p->stream);
// evaluate yield
double yield = (*rx->products_[0].yield_)(E_in);
@ -1097,7 +1097,7 @@ void sample_secondary_photons(Particle* p, int i_nuclide)
double y_t = p->wgt_ * p->neutron_xs_[i_nuclide].photon_prod /
p->neutron_xs_[i_nuclide].total;
int y = static_cast<int>(y_t);
if (prn() <= y_t - y) ++y;
if (prn(p->prn_seeds, p->stream) <= y_t - y) ++y;
// Sample each secondary photon
for (int i = 0; i < y; ++i) {
@ -1110,10 +1110,10 @@ void sample_secondary_photons(Particle* p, int i_nuclide)
auto& rx = data::nuclides[i_nuclide]->reactions_[i_rx];
double E;
double mu;
rx->products_[i_product].sample(p->E_, E, mu);
rx->products_[i_product].sample(p->E_, E, mu, p->prn_seeds, p->stream);
// Sample the new direction
Direction u = rotate_angle(p->u(), mu, nullptr);
Direction u = rotate_angle(p->u(), mu, nullptr, p->prn_seeds, p->stream);
// Create the secondary photon
p->create_secondary(u, E, Particle::Type::photon);

2
src/physics_common.cpp
View file

@ -12,7 +12,7 @@ namespace openmc {
void russian_roulette(Particle* p)
{
if (p->wgt_ < settings::weight_cutoff) {
if (prn() < p->wgt_ / settings::weight_survive) {
if (prn(p->prn_seeds, p->stream) < p->wgt_ / settings::weight_survive) {
p->wgt_ = settings::weight_survive;
p->wgt_last_ = p->wgt_;
} else {

15
src/physics_mg.cpp
View file

@ -78,10 +78,10 @@ void
scatter(Particle* p)
{
data::mg.macro_xs_[p->material_].sample_scatter(p->g_last_, p->g_, p->mu_,
p->wgt_);
p->wgt_, p->prn_seeds, p->stream);
// Rotate the angle
p->u() = rotate_angle(p->u(), p->mu_, nullptr);
p->u() = rotate_angle(p->u(), p->mu_, nullptr, p->prn_seeds, p->stream);
// Update energy value for downstream compatability (in tallying)
p->E_ = data::mg.energy_bin_avg_[p->g_];
@ -103,7 +103,7 @@ create_fission_sites(Particle* p, std::vector<Particle::Bank>& bank)
// Sample the number of neutrons produced
int nu = static_cast<int>(nu_t);
if (prn() <= (nu_t - int(nu_t))) {
if (prn(p->prn_seeds, p->stream) <= (nu_t - int(nu_t))) {
nu++;
}
@ -128,10 +128,10 @@ create_fission_sites(Particle* p, std::vector<Particle::Bank>& bank)
// Sample the cosine of the angle, assuming fission neutrons are emitted
// isotropically
double mu = 2.*prn() - 1.;
double mu = 2.*prn(p->prn_seeds, p->stream) - 1.;
// Sample the azimuthal angle uniformly in [0, 2.pi)
double phi = 2. * PI * prn();
double phi = 2. * PI * prn(p->prn_seeds, p->stream );
site.u.x = mu;
site.u.y = std::sqrt(1. - mu * mu) * std::cos(phi);
site.u.z = std::sqrt(1. - mu * mu) * std::sin(phi);
@ -139,7 +139,8 @@ create_fission_sites(Particle* p, std::vector<Particle::Bank>& bank)
// Sample secondary energy distribution for the fission reaction
int dg;
int gout;
data::mg.macro_xs_[p->material_].sample_fission_energy(p->g_, dg, gout);
data::mg.macro_xs_[p->material_].sample_fission_energy(p->g_, dg, gout, p->prn_seeds,
p->stream);
// Store the energy and delayed groups on the fission bank
site.E = gout;
// We add 1 to the delayed_group bc in MG, -1 is prompt, but in the rest
@ -179,7 +180,7 @@ absorption(Particle* p)
global_tally_absorption += p->wgt_absorb_ * p->macro_xs_.nu_fission /
p->macro_xs_.absorption;
} else {
if (p->macro_xs_.absorption > prn() * p->macro_xs_.total) {
if (p->macro_xs_.absorption > prn(p->prn_seeds, p->stream) * p->macro_xs_.total) {
#pragma omp atomic
global_tally_absorption += p->wgt_ * p->macro_xs_.nu_fission /
p->macro_xs_.absorption;

12
src/plot.cpp
View file

@ -396,11 +396,15 @@ Plot::set_default_colors(pugi::xml_node plot_node)
fatal_error(err_msg);
}
// Initialize a random number stream
uint64_t prn_seed = 1;
int stream = 0;
for (auto& c : colors_) {
c = random_color();
c = random_color(&prn_seed, stream);
// make sure we don't interfere with some default colors
while (c == RED || c == WHITE) {
c = random_color();
c = random_color(&prn_seed, stream);
}
}
}
@ -958,8 +962,8 @@ voxel_finalize(hid_t dspace, hid_t dset, hid_t memspace)
H5Sclose(memspace);
}
RGBColor random_color() {
return {int(prn()*255), int(prn()*255), int(prn()*255)};
RGBColor random_color(uint64_t * prn_seeds, int stream) {
return {int(prn(prn_seeds, stream)*255), int(prn(prn_seeds, stream)*255), int(prn(prn_seeds, stream)*255)};
}
extern "C" int openmc_id_map(const void* plot, int32_t* data_out)

1
src/random_lcg.cpp
View file

@ -141,7 +141,6 @@ prn_set_stream(int i)
extern "C" int64_t openmc_get_seed() {return master_seed;}
// TODO: The idea of this function no longer works -- we'll need to update it somehow
extern "C" void
openmc_set_seed(int64_t new_seed)
{

9
src/reaction_product.cpp
View file

@ -76,25 +76,26 @@ ReactionProduct::ReactionProduct(hid_t group)
}
}
void ReactionProduct::sample(double E_in, double& E_out, double& mu) const
void ReactionProduct::sample(double E_in, double& E_out, double& mu,
uint64_t * prn_seeds, int stream) const
{
auto n = applicability_.size();
if (n > 1) {
double prob = 0.0;
double c = prn();
double c = prn(prn_seeds, stream);
for (int i = 0; i < n; ++i) {
// Determine probability that i-th energy distribution is sampled
prob += applicability_[i](E_in);
// If i-th distribution is sampled, sample energy from the distribution
if (c <= prob) {
distribution_[i]->sample(E_in, E_out, mu);
distribution_[i]->sample(E_in, E_out, mu, prn_seeds, stream);
break;
}
}
} else {
// If only one distribution is present, go ahead and sample it
distribution_[0]->sample(E_in, E_out, mu);
distribution_[0]->sample(E_in, E_out, mu, prn_seeds, stream);
}
}

29
src/scattdata.cpp
View file

@ -167,10 +167,10 @@ ScattData::base_combine(size_t max_order,
//==============================================================================
void
ScattData::sample_energy(int gin, int& gout, int& i_gout)
ScattData::sample_energy(int gin, int& gout, int& i_gout, uint64_t * prn_seeds, int stream)
{
// Sample the outgoing group
double xi = prn();
double xi = prn(prn_seeds, stream);
double prob = 0.;
i_gout = 0;
for (gout = gmin[gin]; gout < gmax[gin]; ++gout) {
@ -347,21 +347,22 @@ ScattDataLegendre::calc_f(int gin, int gout, double mu)
//==============================================================================
void
ScattDataLegendre::sample(int gin, int& gout, double& mu, double& wgt)
ScattDataLegendre::sample(int gin, int& gout, double& mu, double& wgt,
uint64_t * prn_seeds, int stream)
{
// Sample the outgoing energy using the base-class method
int i_gout;
sample_energy(gin, gout, i_gout);
sample_energy(gin, gout, i_gout, prn_seeds, stream);
// Now we can sample mu using the scattering kernel using rejection
// sampling from a rectangular bounding box
double M = max_val[gin][i_gout];
int samples;
for (samples = 0; samples < MAX_SAMPLE; ++samples) {
mu = 2. * prn() - 1.;
mu = 2. * prn(prn_seeds, stream) - 1.;
double f = calc_f(gin, gout, mu);
if (f > 0.) {
double u = prn() * M;
double u = prn(prn_seeds, stream) * M;
if (u <= f) break;
}
}
@ -535,14 +536,15 @@ ScattDataHistogram::calc_f(int gin, int gout, double mu)
//==============================================================================
void
ScattDataHistogram::sample(int gin, int& gout, double& mu, double& wgt)
ScattDataHistogram::sample(int gin, int& gout, double& mu, double& wgt,
uint64_t * prn_seeds, int stream)
{
// Sample the outgoing energy using the base-class method
int i_gout;
sample_energy(gin, gout, i_gout);
sample_energy(gin, gout, i_gout, prn_seeds, stream);
// Determine the outgoing cosine bin
double xi = prn();
double xi = prn(prn_seeds, stream);
int imu;
if (xi < dist[gin][i_gout][0]) {
@ -554,7 +556,7 @@ ScattDataHistogram::sample(int gin, int& gout, double& mu, double& wgt)
}
// Randomly select mu within the imu bin
mu = prn() * dmu + this->mu[imu];
mu = prn(prn_seeds, stream) * dmu + this->mu[imu];
if (mu < -1.) {
mu = -1.;
@ -738,15 +740,16 @@ ScattDataTabular::calc_f(int gin, int gout, double mu)
//==============================================================================
void
ScattDataTabular::sample(int gin, int& gout, double& mu, double& wgt)
ScattDataTabular::sample(int gin, int& gout, double& mu, double& wgt,
uint64_t * prn_seeds, int stream)
{
// Sample the outgoing energy using the base-class method
int i_gout;
sample_energy(gin, gout, i_gout);
sample_energy(gin, gout, i_gout, prn_seeds, stream);
// Determine the outgoing cosine bin
int NP = this->mu.shape()[0];
double xi = prn();
double xi = prn(prn_seeds, stream);
double c_k = dist[gin][i_gout][0];
int k;