All‐Particle Multiscale Computation of Hypersonic Rarefied Flow
All‐Particle Multiscale Computation of Hypersonic Rarefied Flow
复制标题
高超声速稀薄流的全粒子多尺度计算
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
I. Boyd
中科院分区：
文献类型：
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作者：
E. Jun;J. M. Burt;I. Boyd
本研究探讨了一种新的混合粒子方案，用作多尺度流动模拟的替代方法。混合粒子方案在稀薄流区域采用直接模拟蒙特卡罗（DSMC）方法，在连续流区域采用低扩散（LD）粒子方法。低扩散粒子法的数值程序在现有的 DSMC 算法中实现。 LD-DSMC 方法的性能通过研究全局克努森数为 0.002 的球体上 10 马赫的氮气流来评估。混合方案结果与标准 DSMC 和 CFD 计算结果总体吻合。子单元程序用于提高混合方案中的计算效率并降低对 DSMC 单元大小的敏感性。这使得可以在更粗糙的网格上执行 LD-DSMC 模拟，从而显着减少计算时间。
This study examines a new hybrid particle scheme used as an alternative means of multiscale flow simulation. The hybrid particle scheme employs the direct simulation Monte Carlo (DSMC) method in rarefied flow regions and the low diffusion (LD) particle method in continuum flow regions. The numerical procedures of the low diffusion particle method are implemented within an existing DSMC algorithm. The performance of the LD‐DSMC approach is assessed by studying Mach 10 nitrogen flow over a sphere with a global Knudsen number of 0.002. The hybrid scheme results show good overall agreement with results from standard DSMC and CFD computation. Subcell procedures are utilized to improve computational efficiency and reduce sensitivity to DSMC cell size in the hybrid scheme. This makes it possible to perform the LD‐DSMC simulation on a much coarser mesh that leads to a significant reduction in computation time.