A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures
A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures
复制标题
一种新的光线追踪方案，用于高度并行架构上的 3D 漫射辐射传输
DOI：
10.1093/pasj/psv027
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Ken Hasegawa
中科院分区：
文献类型：
--
作者：
Satoshi Tanaka;K. Yoshikawa;T. Okamoto;Ken Hasegawa
我们提出了一种新的数值格式来求解三维网格上漫射辐射的传输，该格式在具有高度并行结构的处理器上是有效的，例如最近流行的多核和多核结构的GPU和CPU。该格式基于光线跟踪法，计算量与N_(Rm)成正比，其中N_(Rm)是网格的个数，其目的是完全并行地计算每条光线的辐射传输，并对光线进行适当分组。实验结果表明，该方案的性能与所采用的CPU核和GPU数量有很好的相关性，并且采用多波前方案在多节点系统上具有很好的并行性，并且性能随计算资源的大小有很好的伸缩性。为了验证我们的方案并为光线跟踪方案的角分辨率提供一个物理判据，我们对中性氢气通过电离辐射源的光致电离进行了几次数值模拟，没有“现场”近似，其中辐射复合漫射辐射的传输是以自洽的方式合并的。
We present a new numerical scheme to solve the transfer of diffuse radiation on three-dimensional mesh grids which is efficient on processors with highly parallel architecture such as recently popular GPUs and CPUs with multi- and many-core architectures. The scheme is based on the ray-tracing method and the computational cost is proportional to $N_{\rm m}^{5/3}$ where $N_{\rm m}$ is the number of mesh grids, and is devised to compute the radiation transfer along each light-ray completely in parallel with appropriate grouping of the light-rays. We find that the performance of our scheme scales well with the number of adopted CPU cores and GPUs, and also that our scheme is nicely parallelized on a multi-node system by adopting the multiple wave front scheme, and the performance scales well with the amount of the computational resources. As numerical tests to validate our scheme and to give a physical criterion for the angular resolution of our ray-tracing scheme, we perform several numerical simulations of the photo-ionization of neutral hydrogen gas by ionizing radiation sources without the "on-the-spot" approximation, in which the transfer of diffuse radiation by radiative recombination is incorporated in a self-consistent manner.
DOI：
10.1111/j.1365-2966.2006.10775.x
发表时间：
2006-03
影响因子：
4.8
作者：
I. Iliev;B. Ciardi;M. Alvarez;A. Maselli;A. Ferrara;N. Gnedin;G. Mellema;T. Nakamoto;M. Norman;A. Razoumov;E. Rijkhorst;J. Ritzerveld;P. Shapiro;H. Susa;M. Umemura;D. J. W. Cita;Mpi;UTexas;Sissa;Fermilab;UChicago;Astron;Leiden Obs.;UTsukuba;U. Diego;Oak Ridge Natl. Lab.;Rikkyo U. Lanl
通讯作者：
I. Iliev;B. Ciardi;M. Alvarez;A. Maselli;A. Ferrara;N. Gnedin;G. Mellema;T. Nakamoto;M. Norman;A. Razoumov;E. Rijkhorst;J. Ritzerveld;P. Shapiro;H. Susa;M. Umemura;D. J. W. Cita;Mpi;UTexas;Sissa;Fermilab;UChicago;Astron;Leiden Obs.;UTsukuba;U. Diego;Oak Ridge Natl. Lab.;Rikkyo U. Lanl