TRAPHIC - Radiative Transfer for Smoothed Particle Hydrodynamics Simulations
TRAPHIC - Radiative Transfer for Smoothed Particle Hydrodynamics Simulations
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DOI：
10.1111/j.1365-2966.2008.13601.x
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发表时间：
2008-02
影响因子：
4.8
通讯作者：
A. Pawlik;J. Schaye
中科院分区：
文献类型：
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作者：
A. Pawlik;J. Schaye
提出了一种用于光滑粒子流体动力学(SPH)模拟的新型辐射传输格式TRAFIFY。TRAFFICE被设计用于在物理长度尺度上显示宽动态范围并且包含大量光源的模拟。它在空间和角度上都是自适应的，可以在分布式存储机器上应用。通过引入源合并过程，避免了通常遇到的随着模拟中的光源数量而进行的计算代价高昂的缩放。(依赖于时间的)辐射传输方程是通过直接在由SPH粒子集跟踪的非结构网格上以显式光子守恒的方式跟踪单个光子包来求解的。尽管SPH粒子的空间分布不规则，但为了实现辐射的定向传输，光子被引导到锥体内。我们提出并测试了在SPH代码Gadget-2中TRAPHIC的并行数值实现，该代码指定用于单色氢电离辐射的传输。试验结果与解析解和其他最先进的辐射传递程序的计算结果符合得很好。
We present traphic, a novel radiative transfer scheme for smoothed particle hydrodynamics (SPH) simulations. traphic is designed for use in simulations exhibiting a wide dynamic range in physical length-scales and containing a large number of light sources. It is adaptive both in space and in angle and can be employed for application on distributed memory machines. The commonly encountered computationally expensive scaling with the number of light sources in the simulation is avoided by introducing a source merging procedure. The (time-dependent) radiative transfer equation is solved by tracing individual photon packets in an explicitly photon-conserving manner directly on the unstructured grid traced out by the set of SPH particles. To accomplish directed transport of radiation despite the irregular spatial distribution of the SPH particles, photons are guided inside cones. We present and test a parallel numerical implementation of traphic in the SPH code gadget-2, specified for the transport of monochromatic hydrogen-ionizing radiation. The results of the tests are in excellent agreement with both analytic solutions and results obtained with other state-of-the-art radiative transfer codes.