19058781736

Committed 04 Nov 2025 05:26AM UTC coverage: 82.008% (-3.1%) from 85.155%

Build # 19058781736

Build Type

Pull #3252

github

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web-flow

Commit Message

Merge b8a72730f into bd76fc056

Pull Request Pull Request #3252: Adding vtkhdf option to write vtk data

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88.31

/src/random_ray/linear_source_domain.cpp

#include "openmc/random_ray/linear_source_domain.h"

#include "openmc/cell.h"
#include "openmc/geometry.h"
#include "openmc/material.h"
#include "openmc/message_passing.h"
#include "openmc/mgxs_interface.h"
#include "openmc/output.h"
#include "openmc/plot.h"
#include "openmc/random_ray/random_ray.h"
#include "openmc/simulation.h"
#include "openmc/tallies/filter.h"
#include "openmc/tallies/tally.h"
#include "openmc/tallies/tally_scoring.h"
#include "openmc/timer.h"

namespace openmc {

//==============================================================================
// LinearSourceDomain implementation
//==============================================================================

void LinearSourceDomain::batch_reset()
{
  FlatSourceDomain::batch_reset();
#pragma omp parallel for
  for (int64_t sr = 0; sr < n_source_regions(); sr++) {
    source_regions_.centroid_iteration(sr) = {0.0, 0.0, 0.0};
    source_regions_.mom_matrix(sr) = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
  }
#pragma omp parallel for
  for (int64_t se = 0; se < n_source_elements(); se++) {
    source_regions_.flux_moments_new(se) = {0.0, 0.0, 0.0};
  }
}

void LinearSourceDomain::update_single_neutron_source(SourceRegionHandle& srh)
{
  // Reset all source regions to zero (important for void regions)
  for (int g = 0; g < negroups_; g++) {
    srh.source(g) = 0.0;
  }

  // Add scattering + fission source
  int material = srh.material();
  if (material != MATERIAL_VOID) {
    double inverse_k_eff = 1.0 / k_eff_;
    MomentMatrix invM = srh.mom_matrix().inverse();

    for (int g_out = 0; g_out < negroups_; g_out++) {
      double sigma_t = sigma_t_[material * negroups_ + g_out];

      double scatter_flat = 0.0f;
      double fission_flat = 0.0f;
      MomentArray scatter_linear = {0.0, 0.0, 0.0};
      MomentArray fission_linear = {0.0, 0.0, 0.0};

      for (int g_in = 0; g_in < negroups_; g_in++) {
        // Handles for the flat and linear components of the flux
        double flux_flat = srh.scalar_flux_old(g_in);
        MomentArray flux_linear = srh.flux_moments_old(g_in);

        // Handles for cross sections
        double sigma_s =
          sigma_s_[material * negroups_ * negroups_ + g_out * negroups_ + g_in];
        double nu_sigma_f = nu_sigma_f_[material * negroups_ + g_in];
        double chi = chi_[material * negroups_ + g_out];

        // Compute source terms for flat and linear components of the flux
        scatter_flat += sigma_s * flux_flat;
        fission_flat += nu_sigma_f * flux_flat * chi;
        scatter_linear += sigma_s * flux_linear;
        fission_linear += nu_sigma_f * flux_linear * chi;
      }

      // Compute the flat source term
      srh.source(g_out) =
        (scatter_flat + fission_flat * inverse_k_eff) / sigma_t;

      // Compute the linear source terms. In the first 10 iterations when the
      // centroids and spatial moments are not well known, we will leave the
      // source gradients as zero so as to avoid causing any numerical
      // instability. If a negative source is encountered, this region must be
      // very small/noisy or have poorly developed spatial moments, so we zero
      // the source gradients (effectively making this a flat source region
      // temporarily), so as to improve stability.
      if (simulation::current_batch > 10 && srh.source(g_out) >= 0.0) {
        srh.source_gradients(g_out) =
          invM * ((scatter_linear + fission_linear * inverse_k_eff) / sigma_t);
      } else {
        srh.source_gradients(g_out) = {0.0, 0.0, 0.0};
      }
    }
  }

  // Add external source if in fixed source mode
  if (settings::run_mode == RunMode::FIXED_SOURCE) {
    for (int g = 0; g < negroups_; g++) {
      srh.source(g) += srh.external_source(g);
    }
  }
}

void LinearSourceDomain::normalize_scalar_flux_and_volumes(
  double total_active_distance_per_iteration)
{
  double normalization_factor = 1.0 / total_active_distance_per_iteration;
  double volume_normalization_factor =
    1.0 / (total_active_distance_per_iteration * simulation::current_batch);

// Normalize flux to total distance travelled by all rays this iteration
#pragma omp parallel for
  for (int64_t se = 0; se < n_source_elements(); se++) {
    source_regions_.scalar_flux_new(se) *= normalization_factor;
    source_regions_.flux_moments_new(se) *= normalization_factor;
  }

// Accumulate cell-wise ray length tallies collected this iteration, then
// update the simulation-averaged cell-wise volume estimates
#pragma omp parallel for
  for (int64_t sr = 0; sr < n_source_regions(); sr++) {
    source_regions_.centroid_t(sr) += source_regions_.centroid_iteration(sr);
    source_regions_.mom_matrix_t(sr) += source_regions_.mom_matrix(sr);
    source_regions_.volume_t(sr) += source_regions_.volume(sr);
    source_regions_.volume_sq_t(sr) += source_regions_.volume_sq(sr);
    source_regions_.volume_naive(sr) =
      source_regions_.volume(sr) * normalization_factor;
    source_regions_.volume(sr) =
      source_regions_.volume_t(sr) * volume_normalization_factor;
    source_regions_.volume_sq(sr) =
      source_regions_.volume_sq_t(sr) / source_regions_.volume_t(sr);
    if (source_regions_.volume_t(sr) > 0.0) {
      double inv_volume = 1.0 / source_regions_.volume_t(sr);
      source_regions_.centroid(sr) = source_regions_.centroid_t(sr);
      source_regions_.centroid(sr) *= inv_volume;
      source_regions_.mom_matrix(sr) = source_regions_.mom_matrix_t(sr);
      source_regions_.mom_matrix(sr) *= inv_volume;
    }
  }
}

void LinearSourceDomain::set_flux_to_flux_plus_source(
  int64_t sr, double volume, int g)
{
  int material = source_regions_.material(sr);
  if (material == MATERIAL_VOID) {
    FlatSourceDomain::set_flux_to_flux_plus_source(sr, volume, g);
  } else {
    source_regions_.scalar_flux_new(sr, g) /= volume;
    source_regions_.scalar_flux_new(sr, g) += source_regions_.source(sr, g);
  }
  // If a source region is small, then the moments are likely noisy, so we zero
  // them. This is reasonable, given that small regions can get by with a flat
  // source approximation anyhow.
  if (source_regions_.is_small(sr)) {
    source_regions_.flux_moments_new(sr, g) = {0.0, 0.0, 0.0};
  } else {
    source_regions_.flux_moments_new(sr, g) *= (1.0 / volume);
  }
}

void LinearSourceDomain::set_flux_to_old_flux(int64_t sr, int g)
{
  source_regions_.scalar_flux_new(sr, g) =
    source_regions_.scalar_flux_old(sr, g);
  source_regions_.flux_moments_new(sr, g) =
    source_regions_.flux_moments_old(sr, g);
}

void LinearSourceDomain::accumulate_iteration_flux()
{
  // Accumulate scalar flux
  FlatSourceDomain::accumulate_iteration_flux();

  // Accumulate scalar flux moments
#pragma omp parallel for
  for (int64_t se = 0; se < n_source_elements(); se++) {
    source_regions_.flux_moments_t(se) += source_regions_.flux_moments_new(se);
  }
}

double LinearSourceDomain::evaluate_flux_at_point(
  Position r, int64_t sr, int g) const
{
  double phi_flat = FlatSourceDomain::evaluate_flux_at_point(r, sr, g);

  Position local_r = r - source_regions_.centroid(sr);
  MomentArray phi_linear = source_regions_.flux_moments_t(sr, g);
  phi_linear *= 1.0 / (settings::n_batches - settings::n_inactive);

  MomentMatrix invM = source_regions_.mom_matrix(sr).inverse();
  MomentArray phi_solved = invM * phi_linear;

  return phi_flat + phi_solved.dot(local_r);
}

} // namespace openmc

1	#include "openmc/random_ray/linear_source_domain.h"
2
3	#include "openmc/cell.h"
4	#include "openmc/geometry.h"
5	#include "openmc/material.h"
6	#include "openmc/message_passing.h"
7	#include "openmc/mgxs_interface.h"
8	#include "openmc/output.h"
9	#include "openmc/plot.h"
10	#include "openmc/random_ray/random_ray.h"
11	#include "openmc/simulation.h"
12	#include "openmc/tallies/filter.h"
13	#include "openmc/tallies/tally.h"
14	#include "openmc/tallies/tally_scoring.h"
15	#include "openmc/timer.h"
16
17	namespace openmc {
18
19	//==============================================================================
20	// LinearSourceDomain implementation
21	//==============================================================================
22
23	void LinearSourceDomain::batch_reset()	6,435✔
24	{
25	FlatSourceDomain::batch_reset();	6,435✔
26	#pragma omp parallel for	3,510✔
27	for (int64_t sr = 0; sr < n_source_regions(); sr++) {	13,098,190✔
28	source_regions_.centroid_iteration(sr) = {0.0, 0.0, 0.0};	13,095,265✔
29	source_regions_.mom_matrix(sr) = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};	13,095,265✔
30	}
31	#pragma omp parallel for	3,510✔
32	for (int64_t se = 0; se < n_source_elements(); se++) {	15,043,990✔
33	source_regions_.flux_moments_new(se) = {0.0, 0.0, 0.0};	15,041,065✔
34	}
35	}	6,435✔
36
37	void LinearSourceDomain::update_single_neutron_source(SourceRegionHandle& srh)	29,630,117✔
38	{
39	// Reset all source regions to zero (important for void regions)
40	for (int g = 0; g < negroups_; g++) {	63,605,674✔
41	srh.source(g) = 0.0;	33,975,557✔
42	}
43
44	// Add scattering + fission source
45	int material = srh.material();	29,630,117✔
46	if (material != MATERIAL_VOID) {	29,630,117✔
47	double inverse_k_eff = 1.0 / k_eff_;	29,190,117✔
48	MomentMatrix invM = srh.mom_matrix().inverse();	29,190,117✔
49
50	for (int g_out = 0; g_out < negroups_; g_out++) {	62,725,674✔
51	double sigma_t = sigma_t_[material * negroups_ + g_out];	33,535,557✔
52
53	double scatter_flat = 0.0f;	33,535,557✔
54	double fission_flat = 0.0f;	33,535,557✔
55	MomentArray scatter_linear = {0.0, 0.0, 0.0};	33,535,557✔
56	MomentArray fission_linear = {0.0, 0.0, 0.0};	33,535,557✔
57
58	for (int g_in = 0; g_in < negroups_; g_in++) {	108,945,474✔
59	// Handles for the flat and linear components of the flux
60	double flux_flat = srh.scalar_flux_old(g_in);	75,409,917✔
61	MomentArray flux_linear = srh.flux_moments_old(g_in);	75,409,917✔
62
63	// Handles for cross sections
64	double sigma_s =
65	sigma_s_[material * negroups_ * negroups_ + g_out * negroups_ + g_in];	75,409,917✔
66	double nu_sigma_f = nu_sigma_f_[material * negroups_ + g_in];	75,409,917✔
67	double chi = chi_[material * negroups_ + g_out];	75,409,917✔
68
69	// Compute source terms for flat and linear components of the flux
70	scatter_flat += sigma_s * flux_flat;	75,409,917✔
71	fission_flat += nu_sigma_f * flux_flat * chi;	75,409,917✔
72	scatter_linear += sigma_s * flux_linear;	75,409,917✔
73	fission_linear += nu_sigma_f * flux_linear * chi;	75,409,917✔
74	}
75
76	// Compute the flat source term
77	srh.source(g_out) =	67,071,114✔
78	(scatter_flat + fission_flat * inverse_k_eff) / sigma_t;	33,535,557✔
79
80	// Compute the linear source terms. In the first 10 iterations when the
81	// centroids and spatial moments are not well known, we will leave the
82	// source gradients as zero so as to avoid causing any numerical
83	// instability. If a negative source is encountered, this region must be
84	// very small/noisy or have poorly developed spatial moments, so we zero
85	// the source gradients (effectively making this a flat source region
86	// temporarily), so as to improve stability.
87	if (simulation::current_batch > 10 && srh.source(g_out) >= 0.0) {	33,535,557✔
88	srh.source_gradients(g_out) =	20,559,022✔
89	invM * ((scatter_linear + fission_linear * inverse_k_eff) / sigma_t);	41,118,044✔
90	} else {
91	srh.source_gradients(g_out) = {0.0, 0.0, 0.0};	12,976,535✔
92	}
93	}
94	}
95
96	// Add external source if in fixed source mode
97	if (settings::run_mode == RunMode::FIXED_SOURCE) {	29,630,117✔
98	for (int g = 0; g < negroups_; g++) {	61,688,594✔
99	srh.source(g) += srh.external_source(g);	32,279,797✔
100	}
101	}
102	}	29,630,117✔
103
104	void LinearSourceDomain::normalize_scalar_flux_and_volumes(	6,435✔
105	double total_active_distance_per_iteration)
106	{
107	double normalization_factor = 1.0 / total_active_distance_per_iteration;	6,435✔
108	double volume_normalization_factor =	6,435✔
109	1.0 / (total_active_distance_per_iteration * simulation::current_batch);	6,435✔
110
111	// Normalize flux to total distance travelled by all rays this iteration
112	#pragma omp parallel for	3,510✔
113	for (int64_t se = 0; se < n_source_elements(); se++) {	15,431,290✔
114	source_regions_.scalar_flux_new(se) *= normalization_factor;	15,428,365✔
115	source_regions_.flux_moments_new(se) *= normalization_factor;	15,428,365✔
116	}
117
118	// Accumulate cell-wise ray length tallies collected this iteration, then
119	// update the simulation-averaged cell-wise volume estimates
120	#pragma omp parallel for	3,510✔
121	for (int64_t sr = 0; sr < n_source_regions(); sr++) {	13,456,090✔
122	source_regions_.centroid_t(sr) += source_regions_.centroid_iteration(sr);	13,453,165✔
123	source_regions_.mom_matrix_t(sr) += source_regions_.mom_matrix(sr);	13,453,165✔
124	source_regions_.volume_t(sr) += source_regions_.volume(sr);	13,453,165✔
125	source_regions_.volume_sq_t(sr) += source_regions_.volume_sq(sr);	13,453,165✔
126	source_regions_.volume_naive(sr) =	26,906,330✔
127	source_regions_.volume(sr) * normalization_factor;	13,453,165✔
128	source_regions_.volume(sr) =	26,906,330✔
129	source_regions_.volume_t(sr) * volume_normalization_factor;	13,453,165✔
130	source_regions_.volume_sq(sr) =	26,906,330✔
131	source_regions_.volume_sq_t(sr) / source_regions_.volume_t(sr);	13,453,165✔
132	if (source_regions_.volume_t(sr) > 0.0) {	13,453,165✔
133	double inv_volume = 1.0 / source_regions_.volume_t(sr);	13,453,160✔
134	source_regions_.centroid(sr) = source_regions_.centroid_t(sr);	13,453,160✔
135	source_regions_.centroid(sr) *= inv_volume;	13,453,160✔
136	source_regions_.mom_matrix(sr) = source_regions_.mom_matrix_t(sr);	13,453,160✔
137	source_regions_.mom_matrix(sr) *= inv_volume;	13,453,160✔
138	}
139	}
140	}	6,435✔
141
142	void LinearSourceDomain::set_flux_to_flux_plus_source(	31,047,709✔
143	int64_t sr, double volume, int g)
144	{
145	int material = source_regions_.material(sr);	31,047,709✔
146	if (material == MATERIAL_VOID) {	31,047,709✔
147	FlatSourceDomain::set_flux_to_flux_plus_source(sr, volume, g);	440,000✔
148	} else {
149	source_regions_.scalar_flux_new(sr, g) /= volume;	30,607,709✔
150	source_regions_.scalar_flux_new(sr, g) += source_regions_.source(sr, g);	30,607,709✔
151	}
152	// If a source region is small, then the moments are likely noisy, so we zero
153	// them. This is reasonable, given that small regions can get by with a flat
154	// source approximation anyhow.
155	if (source_regions_.is_small(sr)) {	31,047,709✔
156	source_regions_.flux_moments_new(sr, g) = {0.0, 0.0, 0.0};	3,158,254✔
157	} else {
158	source_regions_.flux_moments_new(sr, g) *= (1.0 / volume);	27,889,455✔
159	}
160	}	31,047,709✔
161
162	void LinearSourceDomain::set_flux_to_old_flux(int64_t sr, int g)	1,364✔
163	{
164	source_regions_.scalar_flux_new(sr, g) =	2,728✔
165	source_regions_.scalar_flux_old(sr, g);	1,364✔
166	source_regions_.flux_moments_new(sr, g) =	2,728✔
167	source_regions_.flux_moments_old(sr, g);	1,364✔
168	}	1,364✔
169
170	void LinearSourceDomain::accumulate_iteration_flux()	2,640✔
171	{
172	// Accumulate scalar flux
173	FlatSourceDomain::accumulate_iteration_flux();	2,640✔
174
175	// Accumulate scalar flux moments
176	#pragma omp parallel for	1,440✔
177	for (int64_t se = 0; se < n_source_elements(); se++) {	6,577,100✔
178	source_regions_.flux_moments_t(se) += source_regions_.flux_moments_new(se);	6,575,900✔
179	}
180	}	2,640✔
181
UNCOV 182	double LinearSourceDomain::evaluate_flux_at_point(	×
183	Position r, int64_t sr, int g) const
184	{
UNCOV 185	double phi_flat = FlatSourceDomain::evaluate_flux_at_point(r, sr, g);	×
186
UNCOV 187	Position local_r = r - source_regions_.centroid(sr);	×
UNCOV 188	MomentArray phi_linear = source_regions_.flux_moments_t(sr, g);	×
UNCOV 189	phi_linear *= 1.0 / (settings::n_batches - settings::n_inactive);	×
190
UNCOV 191	MomentMatrix invM = source_regions_.mom_matrix(sr).inverse();	×
UNCOV 192	MomentArray phi_solved = invM * phi_linear;	×
193
UNCOV 194	return phi_flat + phi_solved.dot(local_r);	×
195	}
196
197	} // namespace openmc

openmc-dev / openmc / 19058781736

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