The Effect of Synthetic Inflow Boundary Condition On Large Eddy Simulation

Two factors shall be considered for a good turbulent simulation, a) choice of an appropriate turbulence model, b) the specification of realistic boundary conditions especially inlet boundary conditions. Experiments show that RANS models can reach good results with simple analytical or experimental inflow data for the mean velocities and turbulent variables. For LES or DNS simulations where the flow at the inlet is turbulent, the specification of inflow data becomes more problematic and inflow data have significant rule. In this paper the effect of a synthetic eddy method for inlet boundary conditions of simulation flow over a low aspect ratio square cylinder confined in a channel were studied. The results show that the synthetic method can improve the accuracy of simulation dramatically