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ISSN オンライン: 2642-0554

COMPARATIVE STUDY OF LES FOR TURBULENT BUOYANT FLOW IN TERMS OF SGS MODEL AND GRID RESOLUTION

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

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

要約

Subgrid scale (SGS) modelling and grid resolution in large eddy simulation (LES) are addressed for computing turbulent buoyant flow in a confined cavity with two differentially heated side walls. The SGS models compared are all based on the eddy viscosity concept but are subject to variation in formulating the buoyancy effect. It is shown that energetic flow structures enhanced by buoyancy in the boundary layer along the heated/cooled vertical wall exist in the outer layer neighboring the nearly stagnant core region of the cavity. A k−3 buoyancy subrange is identified in large wavenumbers to appear in both the turbulent dynamic and thermal energy spectra next to the k−5/3 subrange.