Consistent strain/stress lag eddy-viscosity model for hybrid RANS/LES

The paper presents a comparison of several hybridization between RANS and LES, and their potential and limitations in an industrial context. The first part of the paper addresses an often eluded problem in the hybrid RANS/LES community: the importance of the baseline statistical model. A new robust low-Reynolds number eddy-viscosity model, derived from a Reynolds-stress model and accounting for the lag between stress and strain is extended to Detached Eddy Simulation (DES), and compared with the most widely used DES models. The potential of two recently proposed hybridization of RANS and LES models is then discussed. The first one is based on a dual-mesh approach, where statistical and scale-resolving simulations are performed on separate grids, with drifts terms allowing to recover the most accurate solution on each grid. The current dual-mesh formulation is then compared with a consistent hybrid filtering combining RANS and LES.