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首页> 外文期刊>Journal of Heat Transfer >Photon Monte Carlo Simulation for Radiative Transfer in Gaseous Media Represented by Discrete Particle Fields
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Photon Monte Carlo Simulation for Radiative Transfer in Gaseous Media Represented by Discrete Particle Fields

机译：离散粒子场代表的气态介质中辐射传递的光子蒙特卡洛模拟

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摘要

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.
机译：已经开发出用于评估辐射热传递问题的蒙特卡洛射线追踪方案，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蒙特卡洛方法中的流场和标量场。在这种情况下，光子射线追踪要求将光学厚度分配给每个点质量。讨论了两种方法：点粒子模型（PPM）（其中未指定粒子的形状）和球形粒子模型（SPM）（其中，粒子被认为是在其整个体积上具有指定辐射特性的球体）。粒子场中光线追踪的另一个问题是光线的影响范围。提出了两种射线建模方法。首先，将每条射线视为标准的无体积线。在另一种方法中，为射线分配了较小的立体角，因此将其视为圆锥体，其锥度远离其中心线而具有衰减的影响功能。基于这些模型，提出了射线与粒子之间的三种不同的交互方案，即线-SPM，锥-PPM和锥-SPM方法，并通过几个测试问题进行了比较。

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