arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.00461physics.comp-phcs.NAmath.NA
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求解可压缩双介质流动问题的混合WENO方法和改进的ghost fluid方法

A hybrid WENO method with modified ghost fluid method for compressible two-medium flow problems

Zhuang Zhao, Yibing Chen, Jianxian Qiu

摘要:

在本文中,我们开发了一种简化的混合加权基本无振荡(WENO)方法,结合修改的幽灵流体方法(MGFM)[28]来模拟可压缩双介质流动问题。该方法通过对界面状态的预测来定义虚流体状态,将两种介质的流动问题转化为两种单介质的流动问题,从而使物质界面变得“不可见”。对于单一介质流情况,我们通过识别与混合WENO格式相同的重建多项式的极值点区域,自动适应线性迎风格式和WENO格式[50]。我们不需要计算它们的确切位置,只需要知道基于零点存在定理的极值点的区域,这是实现简单,节省计算时间。同时,该算法仍然保持了鲁棒性,具有较高的效率。对一维和二维两介质流动问题的数值计算结果表明了该方法的良好性能。

英文摘要:

In this paper, we develop a simplified hybrid weighted essentially non-oscillatory (WENO) method combined with the modified ghost fluid method (MGFM) [28] to simulate the compressible two-medium flow problems. The MGFM can turn the two-medium flow problems into two single-medium cases by defining the ghost fluids status in terms of the predicted the interface status, which makes the material interface "invisible". For the single medium flow case, we adapt between the linear upwind scheme and the WENO scheme automatically by identifying the regions of the extreme points for the reconstruction polynomial as same as the hybrid WENO scheme [50]. Instead of calculating their exact locations, we only need to know the regions of the extreme points based on the zero point existence theorem, which is simpler for implementation and saves computation time. Meanwhile, it still keeps the robustness and has high efficiency. Extensive numerical results for both one and two dimensional two-medium flow problems are performed to demonstrate the good performances of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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