An entropy-stable discontinuous Galerkin approximation for the incompressible Navier-Stokes equations with variable density and artificial compressibility

JOURNAL OF COMPUTATIONAL PHYSICS

卷:408

Article

Manzanero, Juan^1,2  Rubio, Gonzalo^1,2  Kopriva, David A.^3,4  Ferrer, Esteban^1,2  Valero, Eusebio^1,2 

[1] UPM, Sch Aeronaut, ETSIAE, Plaza Cardenal Cisneros 3, E-28040 Madrid, Spain

[2] Univ Politecn Madrid, Ctr Computat Simulat, Campus Montegancedo, R-28660 Madrid, Spain

[3] Florida State Univ, Dept Math, Tallahassee, FL 32306 USA

[4] San Diego State Univ, Computat Sci Res Ctr, San Diego, CA 92182 USA

关键词: Navier-Stokes;    Computational fluid dynamics;    High-order methods;    Discontinuous Galerkin;    Spectral element;   

DOI  :  10.1016/j.jcp.2020.109241

来源: Elsevier

【 摘 要 】

We present a provably stable discontinuous Galerkin spectral element method for the incompressible Navier-Stokes equations with artificial compressibility and variable density. Stability proofs, which include boundary conditions, that follow a continuous entropy analysis are provided. We define a mathematical entropy function that combines the traditional kinetic energy and an additional energy term for the artificial compressibility, and derive its associated entropy conservation law. The latter allows us to construct a provably stable split-form nodal Discontinuous Galerkin (DG) approximation that satisfies the summation-by-parts simultaneous-approximation-term (SBP-SAT) property. The scheme and the stability proof are presented for general curvilinear three-dimensional hexahedral meshes. We use the exact Riemann solver and the Bassi-Rebay 1 (BR1) scheme at the inter-element boundaries for inviscid and viscous fluxes respectively, and an explicit low storage Runge-Kutta RK3 scheme to integrate in time. We assess the accuracy and robustness of the method by solving a manufactured solution, the Kovasznay flow, a lid driven cavity, the inviscid Taylor-Green vortex, and the Rayleigh-Taylor instability. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free