LINEAR AND NONLINEAR EDDY-VISCOSITY TURBULENCE MODELS FOR A CONFINED SWIRLING COAXIAL JET

Abstract

An investigation into the predictive performance of linear and nonlinear eddy-viscosity turbulence models for a confined swirling coaxial jet is presented. The computational results show that the k - l linear model performs very well in predicting the mean flow properties, while almost all nonlinear models overpredict the strength of recirculation and cannot provide satisfactory results. The cubic model of Apsley and Leschziner, derived from an algebraic stress model, yields better results than other cubic models. The deficiency in predicting scalar field is perhaps due to the assumption of constant turbulent Prandtl number and unsteady large-scale motions.