Abstract:

A time marching method in finite volume is presented and applied to time dependent, Reynolds averaged Navier-Stokes equations for transonic diffuser turbulentflows. A two-layers algebraic turbulent model, proposed by Baldwin-Lomax is used for the eddy viscosity function μT. An explicit, two steps time marching method is presented. In the predicting step downwind difference is used in the streamwise direction and central difference in the transverse direction. In the correcting step upwind difference in the streamwise direction and central difference in the transverse direction are applied. The method is first order in time and second order in space. An artificial viscosity or smooth factors are needed to inhibit the numerical oscillation. The uneven time steps and multi-grid techniques are used to accelerate the convergence. The results of the calcalation are in good agreement with experiments.

Key words: inlet, transonic diffuser, numerical simulation