13526388676

Committed 25 Feb 2025 04:44PM UTC coverage: 85.189% (+0.1%) from 85.074%

Build # 13526388676

Build Type

Pull #3327

github

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web-flow

Commit Message

Merge 0614ec2dd into 27258c009

Pull Request Pull Request #3327: Reflect multigroup MicroXS in IndependentOperator docstrings

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89.0

/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_neutron_source(double k_eff)
{
  simulation::time_update_src.start();

  double inverse_k_eff = 1.0 / k_eff;

#pragma omp parallel for
  for (int64_t sr = 0; sr < n_source_regions_; sr++) {
    int material = source_regions_.material(sr);
    if (material == MATERIAL_VOID) {
      continue;
    }
    MomentMatrix invM = source_regions_.mom_matrix(sr).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 = source_regions_.scalar_flux_old(sr, g_in);
        MomentArray flux_linear = source_regions_.flux_moments_old(sr, 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
      source_regions_.source(sr, 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 &&
          source_regions_.source(sr, g_out) >= 0.0) {
        source_regions_.source_gradients(sr, g_out) =
          invM * ((scatter_linear + fission_linear * inverse_k_eff) / sigma_t);
      } else {
        source_regions_.source_gradients(sr, g_out) = {0.0, 0.0, 0.0};
      }
    }
  }

  if (settings::run_mode == RunMode::FIXED_SOURCE) {
// Add external source to flat source term if in fixed source mode
#pragma omp parallel for
    for (int64_t se = 0; se < n_source_elements_; se++) {
      source_regions_.source(se) += source_regions_.external_source(se);
    }
  }

  simulation::time_update_src.stop();
}

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);
  }
  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(g) = source_regions_.scalar_flux_old(g);
  source_regions_.flux_moments_new(g) = source_regions_.flux_moments_old(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()	7,565✔
24	{
25	FlatSourceDomain::batch_reset();	7,565✔
26	#pragma omp parallel for	4,005✔
27	for (int64_t sr = 0; sr < n_source_regions_; sr++) {	3,825,480✔
28	source_regions_.centroid_iteration(sr) = {0.0, 0.0, 0.0};	3,821,920✔
29	source_regions_.mom_matrix(sr) = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};	3,821,920✔
30	}
31	#pragma omp parallel for	4,005✔
32	for (int64_t se = 0; se < n_source_elements_; se++) {	6,850,440✔
33	source_regions_.flux_moments_new(se) = {0.0, 0.0, 0.0};	6,846,880✔
34	}
35	}	7,565✔
36
37	void LinearSourceDomain::update_neutron_source(double k_eff)	7,565✔
38	{
39	simulation::time_update_src.start();	7,565✔
40
41	double inverse_k_eff = 1.0 / k_eff;	7,565✔
42
43	#pragma omp parallel for	4,005✔
44	for (int64_t sr = 0; sr < n_source_regions_; sr++) {	3,825,480✔
45	int material = source_regions_.material(sr);	3,821,920✔
46	if (material == MATERIAL_VOID) {	3,821,920✔
47	continue;	320,000✔
48	}
49	MomentMatrix invM = source_regions_.mom_matrix(sr).inverse();	3,501,920✔
50
51	for (int g_out = 0; g_out < negroups_; g_out++) {	10,028,800✔
52	double sigma_t = sigma_t_[material * negroups_ + g_out];	6,526,880✔
53
54	double scatter_flat = 0.0f;	6,526,880✔
55	double fission_flat = 0.0f;	6,526,880✔
56	MomentArray scatter_linear = {0.0, 0.0, 0.0};	6,526,880✔
57	MomentArray fission_linear = {0.0, 0.0, 0.0};	6,526,880✔
58
59	for (int g_in = 0; g_in < negroups_; g_in++) {	34,228,480✔
60	// Handles for the flat and linear components of the flux
61	double flux_flat = source_regions_.scalar_flux_old(sr, g_in);	27,701,600✔
62	MomentArray flux_linear = source_regions_.flux_moments_old(sr, g_in);	27,701,600✔
63
64	// Handles for cross sections
65	double sigma_s =
66	sigma_s_[material * negroups_ * negroups_ + g_out * negroups_ + g_in];	27,701,600✔
67	double nu_sigma_f = nu_sigma_f_[material * negroups_ + g_in];	27,701,600✔
68	double chi = chi_[material * negroups_ + g_out];	27,701,600✔
69
70	// Compute source terms for flat and linear components of the flux
71	scatter_flat += sigma_s * flux_flat;	27,701,600✔
72	fission_flat += nu_sigma_f * flux_flat * chi;	27,701,600✔
73	scatter_linear += sigma_s * flux_linear;	27,701,600✔
74	fission_linear += nu_sigma_f * flux_linear * chi;	27,701,600✔
75	}
76
77	// Compute the flat source term
78	source_regions_.source(sr, g_out) =	13,053,760✔
79	(scatter_flat + fission_flat * inverse_k_eff) / sigma_t;	6,526,880✔
80
81	// Compute the linear source terms. In the first 10 iterations when the
82	// centroids and spatial moments are not well known, we will leave the
83	// source gradients as zero so as to avoid causing any numerical
84	// instability. If a negative source is encountered, this region must be
85	// very small/noisy or have poorly developed spatial moments, so we zero
86	// the source gradients (effectively making this a flat source region
87	// temporarily), so as to improve stability.
88	if (simulation::current_batch > 10 &&	11,836,160✔
89	source_regions_.source(sr, g_out) >= 0.0) {	5,309,280✔
90	source_regions_.source_gradients(sr, g_out) =	5,052,224✔
91	invM * ((scatter_linear + fission_linear * inverse_k_eff) / sigma_t);	10,104,448✔
92	} else {
93	source_regions_.source_gradients(sr, g_out) = {0.0, 0.0, 0.0};	1,474,656✔
94	}
95	}
96	}
97
98	if (settings::run_mode == RunMode::FIXED_SOURCE) {	7,565✔
99	// Add external source to flat source term if in fixed source mode
100	#pragma omp parallel for	3,285✔
101	for (int64_t se = 0; se < n_source_elements_; se++) {	5,756,680✔
102	source_regions_.source(se) += source_regions_.external_source(se);	5,753,760✔
103	}
104	}
105
106	simulation::time_update_src.stop();	7,565✔
107	}	7,565✔
108
109	void LinearSourceDomain::normalize_scalar_flux_and_volumes(	7,565✔
110	double total_active_distance_per_iteration)
111	{
112	double normalization_factor = 1.0 / total_active_distance_per_iteration;	7,565✔
113	double volume_normalization_factor =	7,565✔
114	1.0 / (total_active_distance_per_iteration * simulation::current_batch);	7,565✔
115
116	// Normalize flux to total distance travelled by all rays this iteration
117	#pragma omp parallel for	4,005✔
118	for (int64_t se = 0; se < n_source_elements_; se++) {	6,850,440✔
119	source_regions_.scalar_flux_new(se) *= normalization_factor;	6,846,880✔
120	source_regions_.flux_moments_new(se) *= normalization_factor;	6,846,880✔
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	4,005✔
126	for (int64_t sr = 0; sr < n_source_regions_; sr++) {	3,825,480✔
127	source_regions_.centroid_t(sr) += source_regions_.centroid_iteration(sr);	3,821,920✔
128	source_regions_.mom_matrix_t(sr) += source_regions_.mom_matrix(sr);	3,821,920✔
129	source_regions_.volume_t(sr) += source_regions_.volume(sr);	3,821,920✔
130	source_regions_.volume_sq_t(sr) += source_regions_.volume_sq(sr);	3,821,920✔
131	source_regions_.volume_naive(sr) =	7,643,840✔
132	source_regions_.volume(sr) * normalization_factor;	3,821,920✔
133	source_regions_.volume(sr) =	7,643,840✔
134	source_regions_.volume_t(sr) * volume_normalization_factor;	3,821,920✔
135	source_regions_.volume_sq(sr) =	7,643,840✔
136	source_regions_.volume_sq_t(sr) / source_regions_.volume_t(sr);	3,821,920✔
137	if (source_regions_.volume_t(sr) > 0.0) {	3,821,920✔
138	double inv_volume = 1.0 / source_regions_.volume_t(sr);	3,821,920✔
139	source_regions_.centroid(sr) = source_regions_.centroid_t(sr);	3,821,920✔
140	source_regions_.centroid(sr) *= inv_volume;	3,821,920✔
141	source_regions_.mom_matrix(sr) = source_regions_.mom_matrix_t(sr);	3,821,920✔
142	source_regions_.mom_matrix(sr) *= inv_volume;	3,821,920✔
143	}
144	}
145	}	7,565✔
146
147	void LinearSourceDomain::set_flux_to_flux_plus_source(	14,549,620✔
148	int64_t sr, double volume, int g)
149	{
150	int material = source_regions_.material(sr);	14,549,620✔
151	if (material == MATERIAL_VOID) {	14,549,620✔
152	FlatSourceDomain::set_flux_to_flux_plus_source(sr, volume, g);	680,000✔
153	} else {
154	source_regions_.scalar_flux_new(sr, g) /= volume;	13,869,620✔
155	source_regions_.scalar_flux_new(sr, g) += source_regions_.source(sr, g);	13,869,620✔
156	}
157	source_regions_.flux_moments_new(sr, g) *= (1.0 / volume);	14,549,620✔
158	}	14,549,620✔
159
160	void LinearSourceDomain::set_flux_to_old_flux(int64_t sr, int g)	×
161	{
162	source_regions_.scalar_flux_new(g) = source_regions_.scalar_flux_old(g);	×
163	source_regions_.flux_moments_new(g) = source_regions_.flux_moments_old(g);	×
164	}
165
166	void LinearSourceDomain::accumulate_iteration_flux()	3,145✔
167	{
168	// Accumulate scalar flux
169	FlatSourceDomain::accumulate_iteration_flux();	3,145✔
170
171	// Accumulate scalar flux moments
172	#pragma omp parallel for	1,665✔
173	for (int64_t se = 0; se < n_source_elements_; se++) {	2,694,120✔
174	source_regions_.flux_moments_t(se) += source_regions_.flux_moments_new(se);	2,692,640✔
175	}
176	}	3,145✔
177
178	double LinearSourceDomain::evaluate_flux_at_point(	×
179	Position r, int64_t sr, int g) const
180	{
181	double phi_flat = FlatSourceDomain::evaluate_flux_at_point(r, sr, g);	×
182
183	Position local_r = r - source_regions_.centroid(sr);	×
184	MomentArray phi_linear = source_regions_.flux_moments_t(sr, g);	×
185	phi_linear *= 1.0 / (settings::n_batches - settings::n_inactive);	×
186
187	MomentMatrix invM = source_regions_.mom_matrix(sr).inverse();	×
188	MomentArray phi_solved = invM * phi_linear;	×
189
190	return phi_flat + phi_solved.dot(local_r);	×
191	}
192
193	} // namespace openmc

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