Photon Monte Carlo Simulation for Radiative Transfer in Gaseous Media Represented by Discrete Particle Fields
Photon Monte Carlo Simulation for Radiative Transfer in Gaseous Media Represented by Discrete Particle Fields
复制标题
离散粒子场代表的气态介质中辐射传输的光子蒙特卡罗模拟
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
M. Modest
中科院分区：
文献类型：
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作者：
Anquan Wang;M. Modest
蒙特卡罗射线追踪方法已经被开发出来用于评估辐射传热问题，其中参与介质由离散点质量表示，例如燃烧建模中经常使用的PDF蒙特卡罗方法中的流场和标量场。在这种情况下，光子射线追踪需要为每个点质量分配光学厚度。讨论了两种方法，点粒子模型（PPM），其中粒子的形状不指定，以及球形粒子模型（SPM），其中粒子被假设为具有特定辐射特性的球体。粒子场中光线追踪的另一个问题是光线的影响区域。提出了两种射线建模方法。首先，每条射线都被视为一条标准的无体积线。在另一种方法中，射线被赋予一个小的立体角，因此被视为一个离其中心线有衰减影响函数的锥体。在此基础上，提出了三种不同的射线与粒子相互作用方案，即线- spm方法、锥- ppm方法和锥- spm方法，并通过若干试验问题进行了比较。
Monte Carlo ray-tracing schemes have been developed for the evaluation of radiative heat transfer for problems, in which the participating medium is represented by discrete point masses, such as the flow field and scalar fields in PDF Monte Carlo methods frequently used in combustion modeling. Photon ray tracing in such cases requires that an optical thickness is assigned to each of the point masses. Two approaches are discussed, the point particle model (PPM), in which the shape of particle is not specified, and the spherical particle model (SPM) in which particles are assumed to be spheres with specified radiation properties across their volumes. Another issue for ray tracing in particle fields is the influence region of a ray. Two ways of modeling a ray are proposed. In the first, each ray is treated as a standard volume-less line. In the other approach, the ray is assigned a small solid angle, and is thus treated as a cone with a decaying influence function away from its centerline. Based on these models, three different interaction schemes between rays and particles are proposed, i.e., line-SPM, cone-PPM and cone-SPM methods, and are compared employing several test problems.