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arXiv 1507.03024math.NAcs.NA
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一种简单且有效的高阶冲击捕捉限步法用于不连续伽辽金方法

A Simple and Effective High-Order Shock-Capturing Limiter for Discontinuous Galerkin Methods

University of Washington(华盛顿大学);Iowa State University(爱荷华州立大学);Michigan State University(密歇根州立大学)

Scott A. Moe, James A. Rossmanith, David C. Seal

AI总结:

本文提出一种结合Barth和Jespersen方法与最大原理保持框架的新型冲击捕捉限步法,通过局部上下界确定和最小阻尼高阶修正,实现简单有效且保持高阶精度的冲击捕捉。

摘要:

当应用于双曲守恒律时,不连续伽辽金有限元方法需要使用冲击捕捉限步法以抑制大解梯度处的非物理振荡。本文开发了一种新型冲击捕捉限步法,结合Barth和Jespersen的方法及Zhang和Shu的最大原理保持框架。该策略通过逐元素遍历网格,通过采样邻近元素变量确定局部上下界,并通过最小阻尼高阶修正来强制这些局部界。该策略简单易实现,有效捕捉冲击,且在光滑区域保持高阶精度。所得到的数值方案应用于一维和二维标准测试,以及笛卡尔和无结构网格上,用于验证和评估方法的准确性和鲁棒性。

英文摘要:

The discontinuous Galerkin (DG) finite element method when applied to hyperbolic conservation laws requires the use of shock-capturing limiters in order to suppress unphysical oscillations near large solution gradients. In this work we develop a novel shock-capturing limiter that combines key ideas from the limiter of Barth and Jespersen [AIAA-89-0366 (1989)] and the maximum principle preserving (MPP) framework of Zhang and Shu [Proc. R. Soc. A, 467 (2011), pp. 2752--2776]. The limiting strategy is based on traversing the mesh element-by-element in order to (1) find local upper and lower bounds on user-defined variables by sampling these variables on neighboring elements, and (2) to then enforce these local bounds by minimally damping the high-order corrections. The main advantages of this limiting strategy is that it is simple to implement, effective at shock capturing, and retains high-order accuracy of the solution in smooth regimes. The resulting numerical scheme is applied to several standard numerical tests in both one and two-dimensions and on both Cartesian and unstructured grids. These tests are used as benchmarks to verify and assess the accuracy and robustness of the 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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