Programme pour le thème C2 vendredi matin salle G

retour au programme

9H30 : n° 564 VMS-LES and hybrid models for flows past a circular cylinder at various Reynolds numbers

Hilde Ouvrard Bruno Koobus Stephen Wornom Simone Camarri Maria-Vittoria Salvetti
Institut de Mathématiques et de Modélisation de Montpellier
The quality of the predictions obtained in numerical simulations is investigated for the flow around a circular cylinder at different Reynolds numbers. This classical test case contains most of the difficulties also encountered in more complex industrial flows, viz. boundary-layer separation not imposed by geometry and an unsteady 3D wake. The variational multiscale large-eddy simulation approach and a hybrid RANS/LES model are used with a mixed finite-element/volume compressible flow solver.

9H50 : n° 1311 Non zonal hybrid RANS/LES models

Roland Schiestel
IRPHE
We show how the concept of partially integrated transport modeling allows to transpose statistical models into subfilter models. It leads to nonzonal hybrid schemes with seamless coupling. They are dedicated to the simulation of turbulent flows on coarse grids, for turbulent flows with strong departure from equilibrium. Examples are given relative to various flows such as homogeneous turbulence, plane channel flow with injection or not, pulsed or not and the mixing of scales and confined jets.

10H10 : n° 1274 T-PITM: a consistent formulation for seamless RANS/TLES coupling

Rémi Manceau Christophe Friess Atabak Fadai-Ghotbi Jacques Borée Thomas Gatski
LEA, Université de Poitiers/ENSMA/CNRS
In the frame of inhomogeneous turbulence, a consistent formalism to seamlessly bridge LES and RANS must be based on temporal filtering. Such an approach is presented, the temporal-PITM, based on a transport equations for the subfilter-scales. In order to obtain a balance resolved/modelled energy consistent with the cutoff frequency imposed by the local mesh refinement, a dynamical subfilter-scale model is used.