Hybrid LES‐RANS modelling: a one‐equation SGS model combined with a <i>k</i>–<i>ω</i> model for predicting recirculating flows

Abstract

Abstract 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 – ω model. LES is used in the remaining part of the flow, and the SGS turbulence is modelled with a one‐equation k sgs 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 – ω model in the RANS region, and from the one‐equation k sgs 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. Copyright © 2003 John Wiley &amp; Sons, Ltd.