Hybrid LES-RANS modelling: a one-equation SGS model combined with a k-(omega) model for predicting recirculating flows

A hybrid LES-RANS modelling approach is proposed. RANS is used in the near wall regions (y+<60), and the turbulence is modelled with a k-(omega) model. LES is used in the remaining part of the flow, and the SGS turbulence is modelled with a oneequation ksgs model. The same continuity and momentum equations are solved throughout the domain, the only difference being that the turbulent viscosity is taken from the k-(omega) model in the RANS region, and from the one-equation ksgs model in the LES region. The new modelling approach is applied to two incompressible flow test cases. They are fully developed flow in a plane channel and the flow over a 2D-hill in a channel.