Ray Effect Mitigation for the Discrete Ordinates Method Using Artificial Scattering
Ray Effect Mitigation for the Discrete Ordinates Method Using Artificial Scattering
复制标题
使用人工散射的离散坐标法的射线效应缓解
DOI:
10.1080/00295639.2020.1730665
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发表时间:
2020
影响因子:
1.2
通讯作者:
Hauck, Cory D.
中科院分区:
文献类型:
--
作者:
Frank, Martin;Kusch, Jonas;Camminady, Thomas;Hauck, Cory D.
Solving the radiative transfer equation with the discrete ordinates (S) method leads to a nonphysical imprint of the chosen quadrature set on the solution. To mitigate these so-called ray effects, we propose a modification of the Smethod that we call artificial scattering S(as-S). The method adds an artificial forward-peaked scattering operator that generates angular diffusion to the solution and thereby mitigates ray effects. Similar to artificial viscosity for spatial discretizations, the additional term vanishes as the number of ordinates approaches infinity. Our method allows an efficient implementation of explicit and implicit time integration according to standard Ssolver technology. For two test cases, we demonstrate a significant reduction of error for the as-Smethod when compared to the standard Smethod, both for explicit and implicit computations. Furthermore, we show that a prescribed numerical precision can be reached with less memory due to the reduction in the number of ordinates.
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影响因子:
4.1
作者:
McClarren, Ryan G.;Holloway, James Paul;Brunner, Thomas A.
通讯作者:
Brunner, Thomas A.
影响因子:
1.2
作者:
W. H. Reed
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影响因子:
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作者:
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通讯作者:
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