Extension of the Viscous Collision Limiting Direct Simulation Monte Carlo Technique to Multiple Species
Extension of the Viscous Collision Limiting Direct Simulation Monte Carlo Technique to Multiple Species
复制标题
粘性碰撞限制直接模拟蒙特卡罗技术扩展到多种物种
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. M. Burt
中科院分区：
文献类型：
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作者：
D. Liechty;J. M. Burt
有许多流场跨越了很宽的长度尺度范围，其中存在稀薄和连续流的区域，并且无论是直接模拟Monte Carlo（DSMC）还是计算流体动力学（CFD）都不能提供适当的解决方案。最近，提出了一种新的粘性碰撞限制（VCL）DSMC技术，将物理扩散的影响纳入碰撞限制器的计算，使低克努森数制度通常限于计算流体动力学更易于处理的全粒子技术。这一原始工作是针对单组分气体导出的。目前的工作扩展了VCL-DSMC技术的气体与多个物种。进行类似的推导以使数值和物理输运系数相等。然而，应用了确定混合物粘度的更严格的处理。在最初的工作中，考虑了内部能量非平衡，这也是在目前的工作中扩展到化学非平衡。
There are many flows fields that span a wide range of length scales where regions of both rarefied and continuum flow exist and neither direct simulation Monte Carlo (DSMC) nor computational fluid dynamics (CFD) provide the appropriate solution everywhere. Recently, a new viscous collision limited (VCL) DSMC technique was proposed to incorporate effects of physical diffusion into collision limiter calculations to make the low Knudsen number regime normally limited to CFD more tractable for an all-particle technique. This original work had been derived for a single-species gas. The current work extends the VCL-DSMC technique to gases with multiple species. Similar derivations were performed to equate numerical and physical transport coefficients. However, a more rigorous treatment of determining the mixture viscosity is applied. In the original work, consideration was given to internal energy non-equilibrium, and this is also extended in the current work to chemical non-equilibrium.