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Merge branch 'develop' into hex_lattice
Conflicts: src/input_xml.F90
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Sterling Harper
commit
c58b4acdff
35 changed files with 2221 additions and 475 deletions
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@ -260,6 +260,65 @@ or sub-elements and can be set to either "false" or "true".
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*Default*: true
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``<resonance_scattering>`` Element
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----------------------------------
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The ``resonance_scattering`` element can contain one or more of the following
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attributes or sub-elements:
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:scatterer:
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An element with attributes/sub-elements called ``nuclide``, ``method``,
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``xs_label``, ``xs_label_0K``, ``E_min``, and ``E_max``. The ``nuclide``
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attribute is the name, as given by the ``name`` attribute within the
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``nuclide`` sub-element of the ``material`` element in ``materials.xml``,
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of the nuclide to which a resonance scattering treatment is to be applied.
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The ``method`` attribute gives the type of resonance scattering treatment
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that is to be applied to the ``nuclide``. Acceptable inputs - none of
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which are case-sensitive - for the ``method`` attribute are ``ARES``,
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``CXS``, ``WCM``, and ``DBRC``. Descriptions of each of these methods
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are documented here_. The ``xs_label`` attribute gives the label for the
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cross section data of the ``nuclide`` at a given temperature. The
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``xs_label_0K`` gives the label for the 0 K cross section data for the
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``nuclide``. The ``E_min`` attribute gives the minimum energy above
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which the ``method`` is applied. The ``E_max`` attribute gives the
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maximum energy below which the ``method`` is applied. One example would
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be as follows:
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.. _here: http://dx.doi.org/10.1016/j.anucene.2014.01.017
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.. code-block:: xml
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<resonance_scattering>
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<scatterer>
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<nuclide>U-238</nuclide>
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<method>ARES</method>
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<xs_label>92238.72c</xs_label>
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<xs_label_0K>92238.00c</xs_label_0K>
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<E_min>5.0e-6</E_min>
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<E_max>40.0e-6</E_max>
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</scatterer>
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<scatterer>
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<nuclide>Pu-239</nuclide>
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<method>dbrc</method>
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<xs_label>94239.72c</xs_label>
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<xs_label_0K>94239.00c</xs_label_0K>
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<E_min>0.01e-6</E_min>
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<E_max>210.0e-6</E_max>
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</scatterer>
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</resonance_scattering>
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.. note:: If the ``resonance_scattering`` element is not given, the free gas,
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constant cross section (``cxs``) scattering model, which has
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historically been used by Monte Carlo codes to sample target
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velocities, is used to treat the target motion of all nuclides. If
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``resonance_scattering`` is present, the ``cxs`` method is applied
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below ``E_min`` and the target-at-rest (asymptotic) kernel is used
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above ``E_max``. An arbitrary number of ``scatterer`` elements may
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be specified, each corresponding to a single nuclide at a single
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temperature.
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*Defaults*: None (scatterer), ARES (method), 0.01 eV (E_min), 1.0 keV (E_max)
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``<run_cmfd>`` Element
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----------------------
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@ -311,6 +370,12 @@ attributes/sub-elements:
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parallelepiped and the last three of which specify the upper-right
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corner. Source sites are sampled uniformly through that parallelepiped.
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To filter a "box" spatial distribution by fissionable material, specify
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"fission" tag instead of "box". The ``parameters`` should be given as six
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real numbers, the first three of which specify the lower-left corner of a
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parallelepiped and the last three of which specify the upper-right
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corner. Source sites are sampled uniformly through that parallelepiped.
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For a "point" spatial distribution, ``parameters`` should be given as
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three real numbers which specify the (x,y,z) location of an isotropic
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point source
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@ -368,6 +433,13 @@ attributes/sub-elements:
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*Default*: 0.988 2.249
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:write_initial:
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An element specifying whether to write out the initial source bank used at
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the beginning of the first batch. The output file is named
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"initial_source.binary(h5)"
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*Default*: false
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``<state_point>`` Element
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-------------------------
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@ -1313,15 +1385,6 @@ Currently, it allows users to accelerate fission source convergence during
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inactive neutron batches. To run CMFD, the ``<run_cmfd>`` element in
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``settings.xml`` should be set to "true".
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``<active_flush>`` Element
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--------------------------
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The ``<active_flush>`` element controls the batch where CMFD tallies should be
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reset. CMFD tallies should be reset before active batches so they are accumulated
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without bias.
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*Default*: 0
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``<begin>`` Element
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-------------------
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@ -1343,7 +1406,25 @@ The ``<display>`` element sets one additional CMFD output column. Options are:
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* "source" - prints the RMS [%] between the OpenMC fission source and CMFD
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fission source.
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*Default*: None
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*Default*: balance
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``<dhat_reset>`` Element
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------------------------
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The ``<dhat_reset>`` element controls whether :math:`\widehat{D}` nonlinear
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CMFD parameters should be reset to zero before solving CMFD eigenproblem.
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It can be turned on with "true" and off with "false".
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*Default*: false
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``<downscatter>`` Element
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-------------------------
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The ``<downscatter>`` element controls whether an effective downscatter cross
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section should be used when using 2-group CMFD. It can be turned on with "true"
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and off with "false".
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*Default*: false
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``<feedback>`` Element
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----------------------
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@ -1354,24 +1435,16 @@ It can be turned on with "true" and off with "false".
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*Default*: false
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``<inactive>`` Element
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----------------------
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``<gauss_seidel_tolerance>`` Element
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--------------------
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The ``<inactive>`` element controls if cmfd tallies should be accumulated
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during inactive batches. For some applications, CMFD tallies may not be
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needed until the start of active batches. This option can be turned on
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with "true" and off with "false"
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The ``<gauss_seidel_tolerance>`` element specifies two parameters. The first is
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the absolute inner tolerance for Gauss-Seidel iterations when performing CMFD
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and the second is the relative inner tolerance for Gauss-Seidel iterations
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for CMFD calculations. It is only used in the standalone CMFD power iteration
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solver and not when PETSc is active.
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*Default*: true
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``<inactive_flush>`` Element
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----------------------------
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The ``<inactive_flush>`` element controls when CMFD tallies are reset during
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inactive batches. The integer set here is the interval at which this reset
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occurs. The amout of resets is controlled with the ``<num_flushes>`` element.
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*Defualt*: 9999
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*Default*: 1.e-10 1.e-5
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``<ksp_monitor>`` Element
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-------------------------
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@ -1380,9 +1453,16 @@ The ``<ksp_monitor>`` element is used to view the convergence of linear GMRES
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iterations in PETSc. This option can be turned on with "true" and turned off
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with "false".
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*Default*: false
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``<ktol>`` Element
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--------------------
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The ``<ktol>`` element specifies the tolerance on the eigenvalue when performing
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CMFD power iteration.
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*Default*: 1.e-8
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``<mesh>`` Element
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------------------
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@ -1451,14 +1531,6 @@ not impact the calculation.
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*Default*: 1.0
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``<num_flushes>`` Element
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-------------------------
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The ``<num_flushes>`` element controls the number of CMFD tally resets that
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occur during inactive CMFD batches.
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*Default*: 9999
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``<power_monitor>`` Element
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---------------------------
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@ -1471,16 +1543,8 @@ This option can be turned on with "true" and turned off with "false".
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-------------------------
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The ``<run_adjoint>`` element can be turned on with "true" to have an adjoint
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calculation be performed on the last batch when CMFD is active.
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*Default*: false
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``<snes_monitor>`` Element
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--------------------------
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The ``<snes_monitor>`` element is used to view the convergence of the nonlinear SNES
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function in PETSc. This option can be turned on with "true" and turned off with "false".
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calculation be performed on the last batch when CMFD is active. OpenMC should be
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compiled with PETSc when using this option.
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*Default*: false
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@ -1493,6 +1557,41 @@ By setting "power", power iteration is used and by setting "jfnk", JFNK is used.
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*Default*: power
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``<shift>`` Element
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--------------------
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The ``<shfit>`` element specifies an optional Wielandt shift parameter for
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accelerating power iterations. It can only be used when PETSc is not active.
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It is by default very large so the impact of the shift is effectively zero.
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*Default*: 1e6
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``<spectral>`` Element
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----------------------
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The ``<spectral>`` element specifies an optional spectral radius that can be set to
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accelerate the convergence of Gauss-Seidel iterations during CMFD power iteration
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solve. Note this is only used in the standalone CMFD solver and does not affect
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the calculation when PETSc is active.
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*Default*: power
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``<stol>`` Element
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------------------
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The ``<stol>`` element specifies the tolerance on the fission source when performing
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CMFD power iteration.
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*Default*: 1.e-8
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``<tally_reset>`` Element
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-------------------------
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The ``<tally_reset>`` element contains a list of batch numbers in which CMFD tallies
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should be reset.
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*Default*: None
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``<write_matrices>`` Element
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----------------------------
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