A two-level finite volume method for the unsteady Navier–Stokes equations based on two local Gauss integrations

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摘要

In this paper we consider a two-level finite volume method for the two-dimensional unsteady Navier–Stokes equations by using two local Gauss integrations. This new stabilized finite volume method is based on the linear mixed finite element spaces. Some new a priori bounds for the approximate solution are derived. Moreover, a two-level stabilized finite volume method involves solving one small Navier–Stokes problem on a coarse mesh with mesh size H, a large general Stokes problem on the fine mesh with mesh size h≪H. The optimal error estimates of the H1-norm for velocity approximation and the L2-norm for pressure approximation are established. If we choose h=O(H2), the two-level method gives the same order of approximation as the one-level stabilized finite volume method. However, our method can save a large amount of computational time.

论文关键词:35Q10,65N30,76D05,Unsteady Navier–Stokes equations,Finite volume method,Two-level method,Error estimates

论文评审过程:Received 6 January 2012, Revised 25 October 2013, Available online 27 December 2013.

论文官网地址:https://doi.org/10.1016/j.cam.2013.12.041