21009137102

Committed 14 Jan 2026 08:41PM UTC coverage: 82.044% (-0.01%) from 82.058%

Build # 21009137102

Build Type

Pull #3727

github

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web-flow

Commit Message

Merge ce04ba30c into 7861adf53

Pull Request Pull Request #3727: Skip tests on documentation-only changes

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88.13

/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();
  double density_mult = srh.density_mult();
  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] * density_mult;

      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] *
                         density_mult;
        double nu_sigma_f =
          nu_sigma_f_[material * negroups_ + g_in] * density_mult;
        double chi = chi_[material * negroups_ + g_out];

        // Compute source terms for flat and linear components of the flux
        scatter_flat += sigma_s * flux_flat;
        scatter_linear += sigma_s * flux_linear;
        if (settings::create_fission_neutrons) {
          fission_flat += nu_sigma_f * flux_flat * chi;
          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()	6,875✔
24	{
25	FlatSourceDomain::batch_reset();	6,875✔
26	#pragma omp parallel for	3,750✔
27	for (int64_t sr = 0; sr < n_source_regions(); sr++) {	13,100,550✔
28	source_regions_.centroid_iteration(sr) = {0.0, 0.0, 0.0};	13,097,425✔
29	source_regions_.mom_matrix(sr) = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};	13,097,425✔
30	}
31	#pragma omp parallel for	3,750✔
32	for (int64_t se = 0; se < n_source_elements(); se++) {	15,061,470✔
33	source_regions_.flux_moments_new(se) = {0.0, 0.0, 0.0};	15,058,345✔
34	}
35	}	6,875✔
36
37	void LinearSourceDomain::update_single_neutron_source(SourceRegionHandle& srh)	29,635,397✔
38	{
39	// Reset all source regions to zero (important for void regions)
40	for (int g = 0; g < negroups_; g++) {	63,653,194✔
41	srh.source(g) = 0.0;	34,017,797✔
42	}
43
44	// Add scattering + fission source
45	int material = srh.material();	29,635,397✔
46	double density_mult = srh.density_mult();	29,635,397✔
47	if (material != MATERIAL_VOID) {	29,635,397✔
48	double inverse_k_eff = 1.0 / k_eff_;	29,195,397✔
49	MomentMatrix invM = srh.mom_matrix().inverse();	29,195,397✔
50
51	for (int g_out = 0; g_out < negroups_; g_out++) {	62,773,194✔
52	double sigma_t = sigma_t_[material * negroups_ + g_out] * density_mult;	33,577,797✔
53
54	double scatter_flat = 0.0f;	33,577,797✔
55	double fission_flat = 0.0f;	33,577,797✔
56	MomentArray scatter_linear = {0.0, 0.0, 0.0};	33,577,797✔
57	MomentArray fission_linear = {0.0, 0.0, 0.0};	33,577,797✔
58
59	for (int g_in = 0; g_in < negroups_; g_in++) {	109,325,634✔
60	// Handles for the flat and linear components of the flux
61	double flux_flat = srh.scalar_flux_old(g_in);	75,747,837✔
62	MomentArray flux_linear = srh.flux_moments_old(g_in);	75,747,837✔
63
64	// Handles for cross sections
65	double sigma_s = sigma_s_[material * negroups_ * negroups_ +	75,747,837✔
66	g_out * negroups_ + g_in] *	75,747,837✔
67	density_mult;	75,747,837✔
68	double nu_sigma_f =
69	nu_sigma_f_[material * negroups_ + g_in] * density_mult;	75,747,837✔
70	double chi = chi_[material * negroups_ + g_out];	75,747,837✔
71
72	// Compute source terms for flat and linear components of the flux
73	scatter_flat += sigma_s * flux_flat;	75,747,837✔
74	scatter_linear += sigma_s * flux_linear;	75,747,837✔
75	if (settings::create_fission_neutrons) {	75,747,837!
76	fission_flat += nu_sigma_f * flux_flat * chi;	75,747,837✔
77	fission_linear += nu_sigma_f * flux_linear * chi;	75,747,837✔
78	}
79	}
80
81	// Compute the flat source term
82	srh.source(g_out) =	67,155,594✔
83	(scatter_flat + fission_flat * inverse_k_eff) / sigma_t;	33,577,797✔
84
85	// Compute the linear source terms. In the first 10 iterations when the
86	// centroids and spatial moments are not well known, we will leave the
87	// source gradients as zero so as to avoid causing any numerical
88	// instability. If a negative source is encountered, this region must be
89	// very small/noisy or have poorly developed spatial moments, so we zero
90	// the source gradients (effectively making this a flat source region
91	// temporarily), so as to improve stability.
92	if (simulation::current_batch > 10 && srh.source(g_out) >= 0.0) {	33,577,797✔
93	srh.source_gradients(g_out) =	20,559,022✔
94	invM * ((scatter_linear + fission_linear * inverse_k_eff) / sigma_t);	41,118,044✔
95	} else {
96	srh.source_gradients(g_out) = {0.0, 0.0, 0.0};	13,018,775✔
97	}
98	}
99	}
100
101	// Add external source if in fixed source mode
102	if (settings::run_mode == RunMode::FIXED_SOURCE) {	29,635,397✔
103	for (int g = 0; g < negroups_; g++) {	61,688,594✔
104	srh.source(g) += srh.external_source(g);	32,279,797✔
105	}
106	}
107	}	29,635,397✔
108
109	void LinearSourceDomain::normalize_scalar_flux_and_volumes(	6,875✔
110	double total_active_distance_per_iteration)
111	{
112	double normalization_factor = 1.0 / total_active_distance_per_iteration;	6,875✔
113	double volume_normalization_factor =	6,875✔
114	1.0 / (total_active_distance_per_iteration * simulation::current_batch);	6,875✔
115
116	// Normalize flux to total distance travelled by all rays this iteration
117	#pragma omp parallel for	3,750✔
118	for (int64_t se = 0; se < n_source_elements(); se++) {	15,450,690✔
119	source_regions_.scalar_flux_new(se) *= normalization_factor;	15,447,565✔
120	source_regions_.flux_moments_new(se) *= normalization_factor;	15,447,565✔
121	}
122
123	// Accumulate cell-wise ray length tallies collected this iteration, then
124	// update the simulation-averaged cell-wise volume estimates
125	#pragma omp parallel for	3,750✔
126	for (int64_t sr = 0; sr < n_source_regions(); sr++) {	13,458,690✔
127	source_regions_.centroid_t(sr) += source_regions_.centroid_iteration(sr);	13,455,565✔
128	source_regions_.mom_matrix_t(sr) += source_regions_.mom_matrix(sr);	13,455,565✔
129	source_regions_.volume_t(sr) += source_regions_.volume(sr);	13,455,565✔
130	source_regions_.volume_sq_t(sr) += source_regions_.volume_sq(sr);	13,455,565✔
131	source_regions_.volume_naive(sr) =	26,911,130✔
132	source_regions_.volume(sr) * normalization_factor;	13,455,565✔
133	source_regions_.volume(sr) =	26,911,130✔
134	source_regions_.volume_t(sr) * volume_normalization_factor;	13,455,565✔
135	source_regions_.volume_sq(sr) =	26,911,130✔
136	source_regions_.volume_sq_t(sr) / source_regions_.volume_t(sr);	13,455,565✔
137	if (source_regions_.volume_t(sr) > 0.0) {	13,455,565✔
138	double inv_volume = 1.0 / source_regions_.volume_t(sr);	13,455,560✔
139	source_regions_.centroid(sr) = source_regions_.centroid_t(sr);	13,455,560✔
140	source_regions_.centroid(sr) *= inv_volume;	13,455,560✔
141	source_regions_.mom_matrix(sr) = source_regions_.mom_matrix_t(sr);	13,455,560✔
142	source_regions_.mom_matrix(sr) *= inv_volume;	13,455,560✔
143	}
144	}
145	}	6,875✔
146
147	void LinearSourceDomain::set_flux_to_flux_plus_source(	31,089,949✔
148	int64_t sr, double volume, int g)
149	{
150	int material = source_regions_.material(sr);	31,089,949✔
151	if (material == MATERIAL_VOID) {	31,089,949✔
152	FlatSourceDomain::set_flux_to_flux_plus_source(sr, volume, g);	440,000✔
153	} else {
154	source_regions_.scalar_flux_new(sr, g) /= volume;	30,649,949✔
155	source_regions_.scalar_flux_new(sr, g) += source_regions_.source(sr, g);	30,649,949✔
156	}
157	// If a source region is small, then the moments are likely noisy, so we zero
158	// them. This is reasonable, given that small regions can get by with a flat
159	// source approximation anyhow.
160	if (source_regions_.is_small(sr)) {	31,089,949✔
161	source_regions_.flux_moments_new(sr, g) = {0.0, 0.0, 0.0};	3,158,254✔
162	} else {
163	source_regions_.flux_moments_new(sr, g) *= (1.0 / volume);	27,931,695✔
164	}
165	}	31,089,949✔
166
167	void LinearSourceDomain::set_flux_to_old_flux(int64_t sr, int g)	1,364✔
168	{
169	source_regions_.scalar_flux_new(sr, g) =	2,728✔
170	source_regions_.scalar_flux_old(sr, g);	1,364✔
171	source_regions_.flux_moments_new(sr, g) =	2,728✔
172	source_regions_.flux_moments_old(sr, g);	1,364✔
173	}	1,364✔
174
175	void LinearSourceDomain::accumulate_iteration_flux()	2,860✔
176	{
177	// Accumulate scalar flux
178	FlatSourceDomain::accumulate_iteration_flux();	2,860✔
179
180	// Accumulate scalar flux moments
181	#pragma omp parallel for	1,560✔
182	for (int64_t se = 0; se < n_source_elements(); se++) {	6,586,800✔
183	source_regions_.flux_moments_t(se) += source_regions_.flux_moments_new(se);	6,585,500✔
184	}
185	}	2,860✔
186
187	double LinearSourceDomain::evaluate_flux_at_point(	×
188	Position r, int64_t sr, int g) const
189	{
190	double phi_flat = FlatSourceDomain::evaluate_flux_at_point(r, sr, g);	×
191
192	Position local_r = r - source_regions_.centroid(sr);	×
193	MomentArray phi_linear = source_regions_.flux_moments_t(sr, g);	×
194	phi_linear *= 1.0 / (settings::n_batches - settings::n_inactive);	×
195
196	MomentMatrix invM = source_regions_.mom_matrix(sr).inverse();	×
197	MomentArray phi_solved = invM * phi_linear;	×
198
199	return phi_flat + phi_solved.dot(local_r);	×
200	}
201
202	} // namespace openmc

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