本文提出一种保持容许性的 LWFR 格式,通过单元平均分解和通量限制,首次将高阶 LW 格式扩展至带源项守恒律,并在 Ten Moment 方程上验证了有效性和精度。
摘要:
Lax-Wendroff Flux Reconstruction (LWFR) 是一种用于求解双曲守恒律的单阶段、高阶、免求积方法。我们对 LWFR 格式进行单元平均分解,类似于 Zhang 和 Shu (2010) 的容许性保持框架。通过对时间平均数值通量进行通量限制,该分解用于获得容许性保持的 LWFR 格式。该容许性保持框架进一步扩展到新提出的带源项守恒律 LWFR 格式扩展中。这是高阶 LW 格式能处理源项的首次扩展。通过在 Livermore 等人的 Ten Moment 方程上进行数值实验,验证了其容许性和精度。
英文摘要:
Lax-Wendroff Flux Reconstruction (LWFR) is a single-stage, high order, quadrature free method for solving hyperbolic conservation laws. We perform a cell average decomposition of the LWFR scheme that is similar to the one used in the admissibility preserving framework of Zhang and Shu (2010). By performing a flux limiting of the time averaged numerical flux, the decomposition is used to obtain an admissibility preserving LWFR scheme. The admissibility preservation framework is further extended to a newly proposed extension of LWFR scheme for conservation laws with source terms. This is the first extension of the high order LW scheme that can handle source terms. The admissibility and accuracy are verified by numerical experiments on the Ten Moment equations of Livermore et al.
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