arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.3190math.NAcs.NA
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时间显式间断伽辽金方法中的粘性激波捕捉

Viscous Shock Capturing in a Time-Explicit Discontinuous Galerkin Method

Courant Institute of Mathematical Sciences, New York University(纽约大学柯朗数学科学研究所);Rice University(莱斯大学);Brown University(布朗大学)

Andreas Klöckner, Tim Warburton, Jan S. Hesthaven

AI总结:

提出一种用于间断伽辽金方法的单元局部激波检测器,通过可靠缩放的单元光滑度估计控制人工粘度,实现对非线性守恒律系统的数值求解。

摘要:

我们提出了一种新颖的、单元局部的激波检测器,用于间断伽辽金(DG)方法。该检测器的输出是一个可靠缩放的、逐单元的光滑度估计,适合作为激波捕捉机制的控制输入。使用人工粘度作为后者,我们得到了一个用于数值求解非线性守恒律系统的DG格式。基于Persson和Peraire的工作,我们充分证明了检测器的设计,并在多个基准问题上分析了其性能。我们进一步解释了将检测器输出转化为局部人工粘度所需的缩放和平滑步骤。最后,我们提供了检测器在使用中的大量数值测试。

英文摘要:

We present a novel, cell-local shock detector for use with discontinuous Galerkin (DG) methods. The output of this detector is a reliably scaled, element-wise smoothness estimate which is suited as a control input to a shock capture mechanism. Using an artificial viscosity in the latter role, we obtain a DG scheme for the numerical solution of nonlinear systems of conservation laws. Building on work by Persson and Peraire, we thoroughly justify the detector's design and analyze its performance on a number of benchmark problems. We further explain the scaling and smoothing steps necessary to turn the output of the detector into a local, artificial viscosity. We close by providing an extensive array of numerical tests of the detector in use.

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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