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    Numerical aspects of including wall roughness effects in the SST k–ω eddy-viscosity turbulence model

    Authors
    Eça, L. and Hoekstra, M.
    Date
    Jan 1, 2011

    This paper presents a study on the numerical requirements of including sand-grain wall roughness effects in the SST k–ω eddy-viscosity model. Three implementations are tried: two retain the direct application of the no-slip condition at the wall, the third is based on a wall function formulation. In the first two options the roughness effect is introduced via a change in wall boundary conditions, either for ω only or for k and ω. The two-dimensional flow along a finite flat plate is adopted to assess the numerical accuracy of the three approaches. The computed results are also compared with semi-empirical formula available in the open literature. It is demonstrated that sand-grain roughness effects can be simulated with acceptable numerical uncertainties with all three options, but the numerical settings to achieve that goal differ significantly.

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    TAGS

    CFD Development CFD/Simulation/Desk Studies Time-domain Simulations Research and Development simulation research

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