Abstract
A full Reynolds-stress-transport model has been incorporated into a general 3D non-orthogonal finite-volume solver and applied, in conjunction with a low-Re eddy-viscosity model for the semi-viscous near-wall sublayer, to two representative 3D flows, one in a circular-to-rectangular transition duct and the other around a streamlined body at high incidence. The purpose of the paper is two-fold: first, it exposes issues pertaining to the implementation of the hybrid closure, which are crucial to numerical stability and computational economy within a minimally diffusive discretization framework; second, the predictive performance of the second-moment closure is contrasted with that of the k-ϵ strategy for complex 3D conditions. The particular implementation pursued allows second-moment closure to be applied at a cost roughly 50% in excess of that needed for conventional eddy-viscosity computations.
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