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arXiv 2005.05734math.NAcs.NA
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有限体积格式在切割单元网格上的状态重分布算法

A state redistribution algorithm for finite volume schemes on cut cell meshes

Marsha Berger, Andrew Giuliani

摘要:

在本文中,我们开发了一种新的技术,称为\textit{state redistribution},允许使用显式时间步进时,近似的解决方案,双曲守恒律嵌入边界网格。状态重分布是在基本有限体积格式的每个时间步或阶段之后应用的后处理技术,使用与全单元的体积成比例的时间步。这个想法是通过暂时将它们合并到更大的、可能重叠的邻域中来稳定切割单元,然后用保持守恒和准确性的稳定值替换切割单元值。我们提出的例子状态重新分配使用两个基本计划:MUSCL和二阶直线法有限体积方案。状态重分布被用来计算在切割单元网格上的气体动力学中的几个标准测试问题的解,具有光滑解和间断解。我们表明,我们的方法不会降低基础方案的准确性,它成功地捕捉到冲击在一个非振荡的方式。

英文摘要:

In this paper we develop a new technique, called \textit{state redistribution}, that allows the use of explicit time stepping when approximating solutions to hyperbolic conservation laws on embedded boundary grids. State redistribution is a postprocessing technique applied after each time step or stage of the base finite volume scheme, using a time step that is proportional to the volume of the full cells. The idea is to stabilize the cut cells by temporarily merging them into larger, possibly overlapping neighborhoods, then replacing the cut cell values with a stabilized value that maintains conservation and accuracy. We present examples of state redistribution using two base schemes: MUSCL and a second order Method of Lines finite volume scheme. State redistribution is used to compute solutions to several standard test problems in gas dynamics on cut cell meshes, with both smooth and discontinuous solutions. We show that our method does not reduce the accuracy of the base scheme and that it successfully captures shocks in a non-oscillatory manner.

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