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arXiv 2201.10502math.NAcs.NAphysics.flu-dyn
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非连续谱元方法的保正熵自适应滤波

Positivity-Preserving Entropy-Based Adaptive Filtering for Discontinuous Spectral Element Methods

Tarik Dzanic, Freddie D. Witherden

摘要:

在这项工作中,我们提出了一个保正的熵为基础的自适应滤波方法的冲击捕捉间断谱元方法。通过调整滤波器的强度,以执行积极性和局部离散最小熵原则,所得到的方法可以鲁棒地解决强不连续性与子元素分辨率,不需要依赖于问题的参数调整,并可以很容易地实现在一般的非结构化网格相对较低的计算成本。该方法的有效性在双曲和混合双曲-抛物守恒律的数值实验中得到了验证,如欧拉和Navier-斯托克斯方程,用于极端激波、激波-涡相互作用和复杂的可压缩湍流问题。

英文摘要:

In this work, we present a positivity-preserving entropy-based adaptive filtering method for shock capturing in discontinuous spectral element methods. By adapting the filter strength to enforce positivity and a local discrete minimum entropy principle, the resulting approach can robustly resolve strong discontinuities with sub-element resolution, does not require problem-dependent parameter tuning, and can be easily implemented on general unstructured meshes with relatively low computational cost. The efficacy of the approach is shown in numerical experiments on hyperbolic and mixed hyperbolic-parabolic conservation laws such as the Euler and Navier-Stokes equations for problems including extreme shocks, shock-vortex interactions, and complex compressible turbulent flows.

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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