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arXiv 2008.09485math.NAcs.NA
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求解不可压Navier-斯托克斯方程的连续与间断Galerkin方法的统一框架

A unified framework of continuous and discontinuous Galerkin methods for solving the incompressible Navier--Stokes equation

Xi Chen, Yuwen Li, Corina Drapaca, John Cimbala

摘要:

在本文中,我们提出了一个统一的数值框架的时间相关的不可压缩Navier-斯托克斯方程产生的$H^1$ -,$H(\text{div})$ -协调,和间断Galerkin方法使用不同的粘性应力张量和惩罚项的压力鲁棒性。在Galerkin空间的极小值假设下,证明了一族隐式龙格-库塔法用于时间离散时的半离散和全离散稳定性。此外,我们提出了一个统一的讨论的惩罚项。数值实验比较我们的计划与经典的计划在文献中在非定常和定常的情况。结果表明,我们的方案是有竞争力的,当应用到著名的基准问题,如泰勒-格林涡,Kovasznay流,势流,盖驱动空腔流,和绕圆柱的流动。

英文摘要:

In this paper, we propose a unified numerical framework for the time-dependent incompressible Navier--Stokes equation which yields the $H^1$-, $H(\text{div})$-conforming, and discontinuous Galerkin methods with the use of different viscous stress tensors and penalty terms for pressure robustness. Under minimum assumption on Galerkin spaces, the semi- and fully-discrete stability is proved when a family of implicit Runge--Kutta methods are used for time discretization. Furthermore, we present a unified discussion on the penalty term. Numerical experiments are presented to compare our schemes with classical schemes in the literature in both unsteady and steady situations. It turns out that our scheme is competitive when applied to well-known benchmark problems such as Taylor--Green vortex, Kovasznay flow, potential flow, lid driven cavity flow, and the flow around a cylinder.

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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