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ISSN オンライン: 2642-0554

A HYBRID LES-RANS MODEL BASED ON A ONE-EQUATION SGS MODEL AND A TWO-EQUATION K−ω MODEL

Lars Davidson
Division of Thermo and Fluid Dynamics, Department of Applied Mechanics, Department of Mechanical Engineering, Chalmers University of Technology, Hörsalvagen 7b, SE41296 Göteborg, Sweden

Shia-Hui Peng
Department of Applied Mechanics, Chalmers University of Technology; and Department of Aeronautics and Systems Integration, Swedish Defence Research Agency (FOI), Sweden

要約

A hybrid LES-RANS model 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 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−ω model in the RANS region, and from the one-equation ksgs model in the LES region. The model is applied to two test cases, both incompressible: fully developed flow in a plane channel and the flow over a 2D-hill in a channel.