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arXiv 2204.08693math.NAcs.NA
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双曲问题DG离散化的一种过滤单调化方法

A filtering monotonization approach for DG discretizations of hyperbolic problems

Giuseppe Orlando

AI总结:

本文提出一种用于双曲问题Discontinuous Galerkin近似的过滤技术,通过过滤函数在解正则时保留高阶格式、在间断时切换至单调低阶近似以抑制虚假振荡,并在$deal.II$框架中结合网格自适应缩小低阶近似区域。

摘要:

我们引入了一种用于双曲问题Discontinuous Galerkin近似的过滤技术。借鉴其他作者针对Hamilton-Jacobi方程提出的方法,我们旨在减少采用高阶空间离散化时在间断处产生的虚假振荡。该目标通过一个过滤函数实现:当解正则时保留高阶格式,否则切换至单调的低阶近似。该方法已在$deal.II$数值库框架中实现,并利用其网格自适应能力来缩小使用低阶近似的区域。多项数值实验证明了所提过滤技术的潜力。

英文摘要:

We introduce a filtering technique for Discontinuous Galerkin approximations of hyperbolic problems. Following an approach already proposed for the Hamilton-Jacobi equations by other authors, we aim at reducing the spurious oscillations that arise in presence of discontinuities when high order spatial discretizations are employed. This goal is achieved using a filter function that keeps the high order scheme when the solution is regular and switches to a monotone low order approximation if it is not. The method has been implemented in the framework of the $deal.II$ numerical library, whose mesh adaptation capabilities are also used to reduce the region in which the low order approximation is used. A number of numerical experiments demonstrate the potential of the proposed filtering technique.

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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