通过 GSIS-DSMC 直接间歇耦合对稀薄气体动力学进行多尺度模拟

IF 2.9 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Liyan Luo, Lei Wu
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引用次数: 0

摘要

一般合成迭代方案(GSIS)在稀薄气体动力学建模中的功效已得到证明,在该方案中,波尔兹曼方程经过数十次迭代后即可得到稳态解,即使使用大空间单元,数值耗散也很小。本文利用 GSIS 的快速收敛和渐近保留特性,消除了直接模拟蒙特卡罗(DSMC)方法的局限性。GSIS 利用从 DSMC 派生的高阶构成关系,间歇性地应用,不仅能快速引导 DSMC 进入稳态,还能消除单元大小必须小于分子平均自由路径的要求。为了验证这种 GSIS-DSMC 混合方法的准确性和效率,我们进行了多次数值测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiscale simulation of rarefied gas dynamics via direct intermittent GSIS-DSMC coupling
The general synthetic iterative scheme (GSIS) has proven its efficacy in modeling rarefied gas dynamics, where the steady-state solutions are obtained after dozens of iterations of the Boltzmann equation, with minimal numerical dissipation even using large spatial cells. In this paper, the fast convergence and asymptotic-preserving properties of the GSIS are harnessed to remove the limitations of the direct simulation Monte Carlo (DSMC) method. The GSIS, which leverages high-order constitutive relations derived from DSMC, is applied intermittently, which not only rapidly steers the DSMC towards steady state, but also eliminates the requirement that the cell size must be smaller than the molecular mean free path. Several numerical tests have been conducted to validate the accuracy and efficiency of this hybrid GSIS-DSMC approach.
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来源期刊
CiteScore
4.50
自引率
4.30%
发文量
35
审稿时长
11 weeks
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