DOI: 10.1615/TSFP4
DEVELOPMENTS IN A LOW-REYNOLDS NUMBER NONLINEAR EDDY-VISCOSITY MODEL FOR FLOWS WITH COMPLEX STRAINS
RÉSUMÉ
Non-linear eddy-viscosity schemes can potentially return better predictions than linear schemes in flows with complex strains, including flow separation and impingement and three-dimensional boundary layers. In their study of separated flow over a 2D hill, Abe et al. (2002) tested numerous models, and identified the non-linear EVM of Abe et al. (2003) as performing the best. The model was proposed in two forms: one based on solving an e equation (denoted AJL-ε), and one in which an ω equation provided the lengthscale (AJL-ω). The present work has further tested the model forms proposed by Abe et al. (2003) in a range of challenging flows. The ε-based scheme is found to perform more reliably, and a number of modifications have been proposed to broaden its width of applicability.