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Old   July 15, 2010, 08:24
Default Near wake and turbulence models
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I am modelling a 2D flow around a cylinder for subcritical Reynolds numbers with RANS and standard k-epsilon turbulence model and wall functions on the surface. When I measure the near wake (length of the recirculation zone behind the cylinder) I observe that this distance is decreasing with increasing Reynolds numbers. Unfortunately this should be the other way around! With increasing Re it should move towards the back side of the cylinder.
Does one of you know if this is cause by applying wall functions (considering no pressure gradient in the boundary layer) or is it due to overestimation of turbulent kinetic energy in front of the cylinder by the turbulence model?
Best regards
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