REYNOLDS STRESS MODEL ASSESSMENT USING ROUND JET EXPERIMENTAL-DATA

Experimental data of Hussein et al. (1993) for the turbulent round jet are used to evaluate individual components of Reynolds stress turbule nce models. Models for terms in the Reynolds stress equations are revi ewed, with particular emphasis on linear and nonlinear pressure-strain models. Improved coefficients for the Choi and Lumley return-to-isotr opy expressions have been developed by the authors. These coefficients are valid for a wider range of flows than the currently used coeffici ents. Pressure-strain and transport model components are compared to t he experimental data for the jet, and agreement is very good, indicati ng that the models are reasonably correct. Predictions using the linea r models are generally as good as those obtained using nonlinear model s, indicating that nonlinear models may not be necessary for engineeri ng accuracy for this flow.