An Evaluation of Turbulence Models For Axisymmetric Confined Jet

Four turbulence models including three k-¿ related turbulence models (standard k-¿ model, RNG k-¿ model and realizable k-¿ model) and v²-f turbulence model are performed for axisymmetric confined jets and the results are compared with the experimental data. As a source to evaluate the numerical results, the physical model consists of a sudden pipe expansion section, with an expansion ratio of 3.75. The results show that each model has its superiority and some limitations and it´s not applicable to introduce a definite model as the best model for simulations of such a kind of flow. But the author believes that, overall, the accuracy of the RNG k-¿ model appears to be superior to other models even though in comparison to other k-¿ models it needs more computational efforts per iteration due to the strong nonlinear terms in its transformed equations.