Modifications for an explicit algebraic stress model

Abstract

An extension of the explicit algebraic stress model, developed by Gatski and Speziale is proposed. The extension implicates some essential characteristics of second-order closure models. The strain-dependent coefficients are modified, resulting in an alleviation of the numerical instabilities involved in the model. A new near-wall damping function f μ in the eddy viscosity relation is introduced. To enhance dissipation in near-wall regions, the model constant C e1 is modified and an extra positive source term is included in the dissipation equation. In addition, a realizable time scale is incorporated to remove the wall singularity