arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.04804math.NAcs.NA
收藏

间断Galerkin方法的二阶导数延迟修正时间离散化

Two-derivative deferred correction time discretization for the discontinuous Galerkin method

Jonas Zeifang, Jochen Schuetz

摘要:

在本文中,我们使用隐式二阶导数延迟校正时间离散化途径,并结合它的空间离散的间断Galerkin谱元方法来解决(非)线性偏微分方程。所得到的数值方法在空间和时间上都具有高阶精度。由于新方案处理两个时间导数,因此必须定义两个导数的空间算子。这导致该方案的扩展系统矩阵。我们分析这个矩阵可能的简化和有效的方法来解决所产生的(非)线性系方程。它示出了如何精心设计的预条件和矩阵的方法允许一个有效的实施和应用的新方案。对于这两个,线性平流和可压缩的欧拉方程,高达八阶精度的时间。最后,说明了该方法如何用于可压缩斯托克斯方程的近似解。

英文摘要:

In this paper, we use an implicit two-derivative deferred correction time discretization approach and combine it with a spatial discretization of the discontinuous Galerkin spectral element method to solve (non-)linear PDEs. The resulting numerical method is high order accurate in space and time. As the novel scheme handles two time derivatives, the spatial operator for both derivatives has to be defined. This results in an extended system matrix of the scheme. We analyze this matrix regarding possible simplifications and an efficient way to solve the arising (non-)linear system of equations. It is shown how a carefully designed preconditioner and a matrix-free approach allow for an efficient implementation and application of the novel scheme. For both, linear advection and the compressible Euler equations, up to eighth order of accuracy in time is shown. Finally, it is illustrated how the method can be used to approximate solutions to the compressible Navier-Stokes equations.

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。

↑