Numerical simulation of flow through an axisymmetric two-dimensional plane diffuser based on a new two-fluid turbulence model

The paper presents the results of a numerical study of the structure of flow through axisymmetric two-dimensional diffusers. The calculations were performed on the basis of solving the system of nonstationary equations of the two-fluid Malikov turbulence model. As a result, the longitudinal velocity profiles in different cross sections of the channel were investigated, and it was shown how grid changes affect the results of the study. The SIMPLEC algorithm was applied for the difference approximation of the initial equations. The viscous terms were approximated by the central difference and, for the convective terms, the counter-flow A.A. Samarsky scheme was used. The correctness of the results was confirmed for Reynolds number Re=20000 by comparing the numerical results with known experimental data. The comparison showed that the new model is able to predict the separated flows with great accuracy.