Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

Compound wall treatment for RANS computation of complex turbulent flows

M. Popovac*, K. Hanjalic
Department of Multi-scale Physics, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

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We present a generalized treatment of wall boundary conditions for RANS computation of turbulent flows and heat transfer, which combines the integration up to the wall with generalized wall functions that include non-equilibrium effects. Wall boundary conditions can thus be defined irrespective of whether the grid point nearest to the wall lies within the viscous sublayer, in the buffer zone, or in the fully turbulent region. The computations with fine and coarse meshes of flows in a plane channel, behind a backward-facing step and in a round impinging jet using the proposed compound wall treatment are in satisfactory agreement with the available experiments and DNS data.

Keywords:  RANS turbulence models; Wall functions; Integration to the wall; Compound wall treatment

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