23097215950

Committed 14 Mar 2026 09:58PM UTC coverage: 81.435% (-0.1%) from 81.58%

Build # 23097215950

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push

github

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web-flow

Commit Message

Implement angular PDF evaluation for angle-energy distributions (#3550)

Co-authored-by: Your Name <you@example.com>
Co-authored-by: GuySten <62616591+GuySten@users.noreply.github.com>
Co-authored-by: GuySten <guyste@post.bgu.ac.il>
Co-authored-by: Eliezer214 <110336440+Eliezer214@users.noreply.github.com>
Co-authored-by: Paul Romano <paul.k.romano@gmail.com>

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80.0

/src/distribution_angle.cpp

#include "openmc/distribution_angle.h"

#include <cmath> // for abs, copysign

#include "openmc/tensor.h"

#include "openmc/endf.h"
#include "openmc/hdf5_interface.h"
#include "openmc/math_functions.h"
#include "openmc/random_lcg.h"
#include "openmc/search.h"
#include "openmc/vector.h" // for vector

namespace openmc {

//==============================================================================
// AngleDistribution implementation
//==============================================================================

AngleDistribution::AngleDistribution(hid_t group)
{
  // Get incoming energies
  read_dataset(group, "energy", energy_);
  int n_energy = energy_.size();

  // Get outgoing energy distribution data
  vector<int> offsets;
  vector<int> interp;
  hid_t dset = open_dataset(group, "mu");
  read_attribute(dset, "offsets", offsets);
  read_attribute(dset, "interpolation", interp);
  tensor::Tensor<double> temp;
  read_dataset(dset, temp);
  close_dataset(dset);

  for (int i = 0; i < n_energy; ++i) {
    // Determine number of outgoing energies
    int j = offsets[i];
    int n;
    if (i < n_energy - 1) {
      n = offsets[i + 1] - j;
    } else {
      n = temp.shape(1) - j;
    }

    // Create and initialize tabular distribution
    tensor::View<double> xs = temp.slice(0, tensor::range(j, j + n));
    tensor::View<double> ps = temp.slice(1, tensor::range(j, j + n));
    tensor::View<double> cs = temp.slice(2, tensor::range(j, j + n));
    vector<double> x {xs.begin(), xs.end()};
    vector<double> p {ps.begin(), ps.end()};
    vector<double> c {cs.begin(), cs.end()};

    // To get answers that match ACE data, for now we still use the tabulated
    // CDF values that were passed through to the HDF5 library. At a later
    // time, we can remove the CDF values from the HDF5 library and
    // reconstruct them using the PDF
    Tabular* mudist =
      new Tabular {x.data(), p.data(), n, int2interp(interp[i]), c.data()};

    distribution_.emplace_back(mudist);
  }
}

double AngleDistribution::sample(double E, uint64_t* seed) const
{
  // Find energy bin and calculate interpolation factor
  int i;
  double r;
  get_energy_index(energy_, E, i, r);

  // Sample between the ith and (i+1)th bin
  if (r > prn(seed))
    ++i;

  // Sample i-th distribution
  double mu = distribution_[i]->sample(seed).first;

  // Make sure mu is in range [-1,1] and return
  if (std::abs(mu) > 1.0)
    mu = std::copysign(1.0, mu);
  return mu;
}

double AngleDistribution::evaluate(double E, double mu) const
{
  // Find energy bin and calculate interpolation factor
  int i;
  double r;
  get_energy_index(energy_, E, i, r);

  double pdf = 0.0;
  if (r > 0.0)
    pdf += r * distribution_[i + 1]->evaluate(mu);
  if (r < 1.0)
    pdf += (1.0 - r) * distribution_[i]->evaluate(mu);
  return pdf;
}

} // namespace openmc

1	#include "openmc/distribution_angle.h"
2
3	#include <cmath> // for abs, copysign
4
5	#include "openmc/tensor.h"
6
7	#include "openmc/endf.h"
8	#include "openmc/hdf5_interface.h"
9	#include "openmc/math_functions.h"
10	#include "openmc/random_lcg.h"
11	#include "openmc/search.h"
12	#include "openmc/vector.h" // for vector
13
14	namespace openmc {
15
16	//==============================================================================
17	// AngleDistribution implementation
18	//==============================================================================
19
20	AngleDistribution::AngleDistribution(hid_t group)	3,110,959✔
21	{
22	// Get incoming energies
23	read_dataset(group, "energy", energy_);	3,110,959✔
24	int n_energy = energy_.size();	3,110,959✔
25
26	// Get outgoing energy distribution data
27	vector<int> offsets;	3,110,959✔
28	vector<int> interp;	3,110,959✔
29	hid_t dset = open_dataset(group, "mu");	3,110,959✔
30	read_attribute(dset, "offsets", offsets);	3,110,959✔
31	read_attribute(dset, "interpolation", interp);	3,110,959✔
32	tensor::Tensor<double> temp;	3,110,959✔
33	read_dataset(dset, temp);	3,110,959✔
34	close_dataset(dset);	3,110,959✔
35
36	for (int i = 0; i < n_energy; ++i) {	29,961,519✔
37	// Determine number of outgoing energies
38	int j = offsets[i];	26,850,560✔
39	int n;	26,850,560✔
40	if (i < n_energy - 1) {	26,850,560✔
41	n = offsets[i + 1] - j;	23,739,601✔
42	} else {
43	n = temp.shape(1) - j;	6,221,918!
44	}
45
46	// Create and initialize tabular distribution
47	tensor::View<double> xs = temp.slice(0, tensor::range(j, j + n));	26,850,560✔
48	tensor::View<double> ps = temp.slice(1, tensor::range(j, j + n));	26,850,560✔
49	tensor::View<double> cs = temp.slice(2, tensor::range(j, j + n));	26,850,560✔
50	vector<double> x {xs.begin(), xs.end()};	26,850,560✔
51	vector<double> p {ps.begin(), ps.end()};	26,850,560✔
52	vector<double> c {cs.begin(), cs.end()};	26,850,560✔
53
54	// To get answers that match ACE data, for now we still use the tabulated
55	// CDF values that were passed through to the HDF5 library. At a later
56	// time, we can remove the CDF values from the HDF5 library and
57	// reconstruct them using the PDF
58	Tabular* mudist =	26,850,560✔
59	new Tabular {x.data(), p.data(), n, int2interp(interp[i]), c.data()};	26,850,560✔
60
61	distribution_.emplace_back(mudist);	26,850,560✔
62	}	107,402,240✔
63	}	3,110,959✔
64
65	double AngleDistribution::sample(double E, uint64_t* seed) const	846,557,830✔
66	{
67	// Find energy bin and calculate interpolation factor
68	int i;	846,557,830✔
69	double r;	846,557,830✔
70	get_energy_index(energy_, E, i, r);	846,557,830✔
71
72	// Sample between the ith and (i+1)th bin
73	if (r > prn(seed))	846,557,830✔
74	++i;	348,926,625✔
75
76	// Sample i-th distribution
77	double mu = distribution_[i]->sample(seed).first;	846,557,830✔
78
79	// Make sure mu is in range [-1,1] and return
80	if (std::abs(mu) > 1.0)	846,557,830!
81	mu = std::copysign(1.0, mu);	×
82	return mu;	846,557,830✔
83	}
84
NEW 85	double AngleDistribution::evaluate(double E, double mu) const	×
86	{
87	// Find energy bin and calculate interpolation factor
NEW 88	int i;	×
NEW 89	double r;	×
NEW 90	get_energy_index(energy_, E, i, r);	×
91
NEW 92	double pdf = 0.0;	×
NEW 93	if (r > 0.0)	×
NEW 94	pdf += r * distribution_[i + 1]->evaluate(mu);	×
NEW 95	if (r < 1.0)	×
NEW 96	pdf += (1.0 - r) * distribution_[i]->evaluate(mu);	×
NEW 97	return pdf;	×
98	}
99
100	} // namespace openmc

openmc-dev / openmc / 23097215950

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