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Replace pi constant with more accurate version

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This commit is contained in:
Paul Romano 2021-03-23 17:09:31 -05:00
parent 03244d755f
commit c64e64dac2
1 changed files with 7 additions and 9 deletions
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16
include/openmc/constants.h
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@ -69,16 +69,14 @@ constexpr double EXTSRC_REJECT_FRACTION {0.05};
// ============================================================================
// MATH AND PHYSICAL CONSTANTS
// Values here are from the Committee on Data for Science and Technology
// (CODATA) 2018 recommendation (https://physics.nist.gov/cuu/Constants/).
// TODO: cmath::M_PI has 3 more digits precision than the Fortran constant we
// use so for now we will reuse the Fortran constant until we are OK with
// modifying test results
constexpr double PI {3.1415926535898};
// TODO: replace with <numbers> when we go for C++20
constexpr double PI {3.141592653589793238462643383279502884L};
const double SQRT_PI {std::sqrt(PI)};
constexpr double INFTY {std::numeric_limits<double>::max()};
// Values here are from the Committee on Data for Science and Technology
// (CODATA) 2018 recommendation (https://physics.nist.gov/cuu/Constants/).
// Physical constants
constexpr double MASS_NEUTRON {1.00866491595}; // mass of a neutron in amu
constexpr double MASS_NEUTRON_EV {939.56542052e6}; // mass of a neutron in eV/c^2
@ -110,8 +108,8 @@ constexpr int NUCLIDE_NONE {-1};
// Temperature treatment method
enum class TemperatureMethod {
NEAREST,
INTERPOLATION
NEAREST,
INTERPOLATION
};
// Reaction types