Working Paper Article Version 1 This version is not peer-reviewed

Scalable Block Preconditioners in Computational Fluid Dynamics at High Reynolds Number

Version 1 : Received: 21 July 2020 / Approved: 23 July 2020 / Online: 23 July 2020 (08:19:41 CEST)

How to cite: Bergamaschi, L.; Zanetti, F. Scalable Block Preconditioners in Computational Fluid Dynamics at High Reynolds Number. Preprints 2020, 2020070538 Bergamaschi, L.; Zanetti, F. Scalable Block Preconditioners in Computational Fluid Dynamics at High Reynolds Number. Preprints 2020, 2020070538

Abstract

We review a number of preconditioners for the advection-diffusion operator and for the Schur complement matrix which in turn constitute the building blocks for Constraint and Triangular Preconditioners to accelerate the iterative solution of the discretized and linearized Navier-Stokes equations. An intensive numerical testing is performed onto the driven cavity problem with low values of the viscosity coefficient. We devise an efficient multigrid preconditioner for the advection-diffusion matrix which, combined with the commuted BFBt Schur complement approximation, and inserted in a 2 x 2 block preconditioner, provides convergence of the GMRES method in a number of iteration independent of the meshsize for the lowest values of the viscosity parameter. The low-rank acceleration of such preconditioner is also investigated showing its great potential.

Subject Areas

preconditioners; low-rank updates; Navier-Stokes equations; GMRES method

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