A comparative study of turbulence models performance in predicting the frequency of naturally-excited oscillating jet flows

This paper presents a comparative study of turbulence models performance in prediction the oscillating characteristics of naturally excited jet flows. The unsteady averaged Navier-Stoks equations for turbulent incompressible flow and five variant turbulence closures are used in this study. A large family of turbulence models exists in the literature which is far too extensive to be reviewed here. The models are ranged from simple algebraic expressions for the eddy viscosity to more elaborated formulations which introduce a separate transport equation for each component of the Reynolds stresses. The software, FLUENT 6.3.26, was employed for solving the governing equations. Computational results compared with reported experimental data. The standard k-ε and SST k-ω models clearly showed better results than the others. The accuracy of standard k-ε model decreases with decreasing the nozzle inlet velocity and it failed to predict the minimum excitation velocity (minimum excitation kinetic energy) in the self excited fluidic nozzle.