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arXiv 1906.03993math.NAcs.NAphysics.comp-ph
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有限体积Navier-斯托克斯方程刚性精度对角隐式龙格-库塔法的精度

On the accuracy of stiff-accurate diagonal implicit Runge-Kutta methods for finite volume based Navier-Stokes equations

Jiawei Wan, Ahsan Kareem, Haili Liao, Yunzhu Cai

摘要:

本文的目的是发展低存储的隐式龙格-库塔法,这是易于实现和实现的速度和压力的高阶收敛的有限体积列式的不可压缩Navier-斯托克斯方程在静态同位网格。为此,动量插值的效果,一个程序所需的有限体积法的同位网格,对空间离散的Navier-斯托克斯方程的微分代数性质应首先检查。建立了一种新的动量插值框架,在此框架下,半离散Navier-斯托克斯方程可以严格地看作是指数为2的微分代数方程组.所提出的动量插值框架的准确性和收敛性进行了检查。然后,我们提出了一种新的方法,隐式Runge-Kutta格式的时间推进的指数2系统的不可压Navier-斯托克斯方程。与标准方法相比,所提出的方法显着降低了动量插值的数值难度,并提供更高阶的压力,而不需要额外的计算工作。采用刚性精度对角隐式Runge-Kutta(DIRK)格式与所提出的方法,使该计划达到经典的速度和压力的收敛阶。我们还开发了两个家庭的低存储刚性准确的DIRK计划,以减少其实现所需的存储。以二维Taylor-Green涡为例,验证了本文方法在模拟不可压流动时的时空精度。

英文摘要:

The paper aims at developing low-storage implicit Runge-Kutta methods which are easy to implement and achieve higher-order of convergence for both the velocity and pressure in the finite volume formulation of the incompressible Navier-Stokes equations on a static collocated grid. To this end, the effect of the momentum interpolation, a procedure required by the finite volume method for collocated grids, on the differential-algebraic nature of the spatially-discretized Navier-Stokes equations should be examined first. A new framework for the momentum interpolation is established, based on which the semi-discrete Navier-Stokes equations can be strictly viewed as a system of differential-algebraic equations of index 2. The accuracy and convergence of the proposed momentum interpolation framework is examined. We then propose a new method of applying implicit Runge-Kutta schemes to the time-marching of the index 2 system of the incompressible Navier-Stokes equations. Compared to the standard method, the proposed one significantly reduces the numerical difficulties in momentum interpolations and delivers higher-order pressures without requiring additional computational effort. Applying stiff-accurate diagonal implicit Runge-Kutta (DIRK) schemes with the proposed method allows the schemes to attain the classical order of convergence for both the velocity and pressure. We also develop two families of low-storage stiff-accurate DIRK schemes to reduce the storage required by their implementations. Examining the two dimensional Taylor-Green vortex as an example, the spatial and temporal accuracy of the proposed methods in simulating incompressible flow is demonstrated.

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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