Optimal Error Estimation of the Modified Ghost Fluid Method

Optimal Error Estimation of the Modified Ghost Fluid Method
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改进幻影流体法的最优误差估计

DOI:
10.4208/cicp.110509.271009a
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发表时间:
2010-06
影响因子:
3.7
通讯作者:
Liu, Tiegang
Liu, Tiegang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xu, Liang;Liu, Tiegang

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改进的鬼流体法(MGFM)被证明是适用于多介质可压缩流动的稳健和有效的方法。本文严格分析了MGFM应用于多流体Riemann问题时的最优误差估计。通过分析MGFM和近似Riemann问题求解器(ARPS)的性质,我们证明了MGFM提供的界面状态在与Riemann问题的精确解相比的意义上可以达到“三阶精度”,无论解的类型是什么。此外,我们的分析进一步表明,基于MGFM中双激波结构的ARPS几乎适用于任何预测界面状态的条件,而“三阶精度”的“自然”方法几乎没有那么有用。给出了各种算例,验证了所得结论。AMS科目分类:35L45、65C20、76T10
The modified ghost fluid method (MGFM) has been shown to be robust and efficient when being applied to multi-medium compressible flows. In this paper, we rigorously analyze the optimal error estimation of the MGFM when it is applied to the multi-fluid Riemann problem. By analyzing the properties of the MGFM and the approximate Riemann problem solver (ARPS), we show that the interfacial status provided by the MGFM can achieve “third-order accuracy” in the sense of comparing to the exact solution of the Riemann problem, regardless of the solution type. In addition, our analysis further reveals that the ARPS based on a doubled shock structure in the MGFM is suitable for almost any conditions for predicting the interfacial status, and that the “natural” approach of “third-order accuracy” is practically less useful. Various examples are presented to validate the conclusions made. AMS subject classifications: 35L45, 65C20, 76T10
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