Study on General Wall Damping Functions Definition: A Low Reynolds Number Bounded Flows Validation

A modification of the damping functions in the turbulent dissipation rate transport equations is proposed based on the study given by [1]. The modification accounts for a generalization of the applicability to complex geometries and complex flows. The validation of the proposed model is carried out with Computational Fluid Dynamics (CFD) against a fully developed pipe flow and sharp-bent pipe, both at transitional Reynolds numbers where common turbulence models fail in an accurate predictions of the flow and turbulent characteristics. The results achieved for both geometries demonstrate that the present formulation is able to provide higher agreement and accuracy in the prediction of the flow, in relation to velocity and turbulence characteristics. It has been concluded therefore that the present formulation shows a higher generality in comparison with previously available models, accounting for a more reliable applicability and wider number of cases.