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openmc-dev / openmc / 21621311327

03 Feb 2026 07:35AM UTC coverage: 81.677% (-0.09%) from 81.763%
21621311327

Pull #3751

github

web-flow
Merge 57b5d2785 into b41e22f68
Pull Request #3751: Resolve conflict with weight windows and global russian roulette

17335 of 24277 branches covered (71.41%)

Branch coverage included in aggregate %.

77 of 84 new or added lines in 5 files covered. (91.67%)

113 existing lines in 1 file now uncovered.

55948 of 65446 relevant lines covered (85.49%)

44199446.16 hits per line

Source File
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78.26
/src/physics_common.cpp
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#include "openmc/physics_common.h"
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#include "openmc/random_lcg.h"
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#include "openmc/settings.h"
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namespace openmc {
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//==============================================================================
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// RUSSIAN_ROULETTE
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//==============================================================================
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void russian_roulette(Particle& p, double weight_survive)
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{
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  if (weight_survive * prn(p.current_seed()) < p.wgt()) {
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    p.wgt() = weight_survive;
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  } else {
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    p.wgt() = 0.;
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  }
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}
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void apply_russian_roulette(Particle& p)
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{
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  // Exit if survival biasing is turned off
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  if (!settings::survival_biasing)
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    return;
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  // if survival normalization is on, use normalized weight cutoff and
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  // normalized weight survive
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  if (settings::survival_normalization) {
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    if (p.wgt() < settings::weight_cutoff * p.wgt_born()) {
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      russian_roulette(p, settings::weight_survive * p.wgt_born());
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    }
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  } else if (p.wgt() < settings::weight_cutoff) {
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    russian_roulette(p, settings::weight_survive);
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  }
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}
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} // namespace openmc
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