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arXiv 1806.01575math.NAcs.NA
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重构/通量重构校正方法的误差有界性

Error boundedness of Correction Procedure via Reconstruction / Flux Reconstruction

Philipp Öffner

摘要:

研究了线性双曲型守恒律方程重构/通量重构(CPR/FR)校正方法的长时间误差行为。我们发现,不仅选择的数值通量(迎风或中央)影响的增长率和渐近值的错误,但基地(Gaujiang-Lobatto或Gaujiang-Legendre)的选择是更重要的。使用高斯-勒让德基,误差比使用高斯-洛巴托基时更快地达到渐近值并且达到更低的值。此外,在高斯-勒让德情况下,由数值通量引起的误差的差异对于低分辨率计算并不重要。这种行为在一个特定的FR方案上更好地观察到,该方案与不连续Galerkin框架有很强的联系,但也适用于具有低阶分辨率计算的其他通量重建方案。

英文摘要:

We study the long-time error behavior of correction procedure via reconstruction / flux reconstruction (CPR/FR) methods for linear hyperbolic conservation laws. We show that not only the choice of the numerical flux (upwind or central) affects the growth rate and asymptotic value of the error, but that the selection of bases (Gauß-Lobatto or Gauß-Legendre) is even more important. Using a Gauß-Legendre basis, the error reaches the asymptotic value faster and to a lower value than when using a Gauß-Lobatto basis. Also, the differences in the error caused by the numerical flux are not essential for low resolution computations in the Gauß-Legendre case. This behavior is better seen on a particular FR scheme which has a strong connection with the discontinuous Galerkin framework but holds also for other flux reconstruction schemes with low order resolution computations.

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