Séance Séminaire

Soutenances de thèses

Simulation of massively detached turbulent flows by scale resolving approaches : numerics and turbulence modeling

This work is a contribution to the simulation of turbulent flows characterized by significant separations. After specifying the numerical ingredients and the scale resolving turbulence models used in our simulations, we first investigate the capabilities of our variational multiscale LES approach to capture Reynolds number effects in the subcritical regime for the circular cylinder benchmark. Next, we investigate the effect of dynamic subgrid scale modeling in variational multiscale LES simulations of bluff-body flows. Then, we present a volume-agglomeration multirate time-advancing approach for the solution of the compressible Navier-Stokes equations. A CENO scheme based on a third degree polynomial reconstruction of the solution inside each cell is also developed and assessed. Next, we present a new mesh adaptation method for the simulation of compressible flows using hybrid RANS/LES turbulence models. At last, the effect of the numerics and the turbulence modeling in the simulation of the flow around a circular cylinder is studied and some challenging pre-industrial simulations are finally presented.