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arXiv 2102.09876physics.flu-dyncs.NAmath.NA
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激波捕捉格式的数值超调

On the numerical overshoots of shock-capturing schemes

Huaibao Zhang, Fan Zhang

摘要:

本说明介绍了一个简单的指标,基准冲击捕捉计划。该度量特别关注激波捕获过冲,这可能会破坏数值模拟的鲁棒性以及数值结果的可靠性。其思想是数值求解模型的线性平流方程的初始条件的方波具有不同的波数。经过一步时间演化,精确的数值超调误差可以很容易地确定,并显示为CFL数和约化波数的函数。与超调误差量化本度量,一些有代表性的冲击捕获方案进行了相应的分析,和几个发现,包括超调的振幅非单调变化的CFL数,和超调的振幅显着依赖于减少波数的方波(间断),是新发现的,这是以前没有的。

英文摘要:

This note introduces a simple metric for benchmarking shock-capturing schemes. This metric is especially focused on the shock-capturing overshoots, which may undermine the robustness of numerical simulations, as well as the reliability of numerical results. The idea is to numerically solve the model linear advection equation with an initial condition of a square wave characterized with different wavenumbers. After one step of temporal evolution, the exact numerical overshoot error can be easily determined and shown as a function of the CFL number and the reduced wavenumber. With the overshoot error quantified by the present metric, a number of representative shock-capturing schemes are analyzed accordingly, and several findings including the amplitude of overshoots non-monotonously varying with the CFL number, and the amplitude of overshoots significantly depending on the reduced wavenumber of the square waves (discontinuities), are newly discovered, which are not before.

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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