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DSMC Acceleration Techniques Applied to Shock Heated and Recirculating Flows

机译：DSMC加速技术应用于冲击加热和再循环流

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Direct simulation Monte Carlo (DSMC) calculations provide a suitable technique to study flows in the transition regime between continuum and free-molecular flow. However. DSMC becomes computationally expensive for near continuum flows because of three requirements: (1) cell sizes must be refined to the local mean free path (2) time steps must be smaller than the local mean collision time and (3) a sufficient number of simulation particles is required for statistical reasons. The current work investigates two acceleration techniques; namely the subcell method and the variable time step method, and evaluates the accuracy and efficiency of these methods through a parametric study of hypersonic flow over a cylinder geometry. Stagnation line temperature profiles, along with surface heat flux profiles, serve as the relevant macroscopic results to judge numerical convergence. In addition, converged DSMC results are presented for hypersonic flow over an expansion/compression geometry, referred to as the "tick" configuration. Specifically DSMC results for both non-reacting and reacting air flows are obtained for conditions matching ongoing experiments performed in a high-enthalpy wind tunnel facility.
机译：直接模拟蒙特卡洛（DSMC）计算提供了一种研究连续体和自由分子流之间过渡态中的流的合适技术。然而。由于以下三个要求，DSMC对于近乎连续的流而言在计算上变得昂贵：（1）像元大小必须细化为局部平均自由路径（2）时间步长必须小于局部平均碰撞时间，并且（3）足够数量的模拟出于统计原因，粒子是必需的。当前的工作研究了两种加速技术：子电池法和可变时间步长法，并通过对圆柱几何上的超音速流进行参数研究来评估这些方法的准确性和效率。停滞线温度曲线和表面热通量曲线一起用作判断数值收敛的相关宏观结果。此外，还提供了在膨胀/压缩几何体上的高超声速流动的收敛DSMC结果，称为“刻度”配置。具体而言，在与高焓风洞设施中正在进行的实验相匹配的条件下，可以获得DSMC的非反应气流和反应气流的结果。

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