An explicit finite volume scheme on staggered grids for the Euler equations: Unstructured meshes, stability analysis, and energy conservation. (13th October 2021)

• Record Type: Journal Article
• Authors: Goudon, Thierry; Llobell, Julie; Minjeaud, Sebastian
• Is Part Of: International journal for numerical methods in fluids. Volume 94:Number 1(2022)
• Page Start: 76
• Page End: 119
• Publication Date: 2021-10-13
• Subjects: discrete duality finite volume -- Euler equations -- staggered grids; Fluid dynamics -- Mathematics -- Periodicals; 532
• DOI: 10.1002/fld.5048
• Languages: English
• ISSNs: 0271-2091

Abstract

Abstract: We set up a numerical strategy for the simulation of the Euler equations, in the framework of finite volume staggered discretizations where numerical densities, energies, and velocities are stored on different locations. The main difficulty relies on the treatment of the total energy, which mixes quantities stored on different grids. The proposed method is strongly inspired, on the one hand, from the kinetic framework for the definition of the numerical fluxes, and, on the other hand, from the discrete duality finite volume (DDFV) framework, which has been designed for the simulation of elliptic equations on complex meshes. The time discretization is explicit and we exhibit stability conditions that guaranty the positivity of the discrete densities and internal energies. Moreover, while the scheme works on the internal energy equation, we can define a discrete total energy which satisfies a local conservation equation. We provide a set of numerical simulations to illustrate the behavior of the scheme. Abstract : We set up a finite volume scheme for the Euler equations on staggered unstructured grids with numerical densities, energies, and velocities stored on different locations. This time‐explicit method is strongly inspired, on the one hand, from the kinetic framework for the definition of the numerical fluxes, and, on the other hand, from the discrete duality finite volume (DDFV) framework. We exhibit stability conditions that guaranty the positivity of the discrete densities and internal energies; and, remarkably, while the scheme works on the internal energy equation, we can define a discrete total energy which satisfies a local conservation equation.