Séance Séminaire

Séminaire ACSIOM

A finite volume scheme on unstructured staggered grids for the Euler equations

We propose 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 framework, which has been designed for the simulation of elliptic equations on complex meshes. 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.