LES and PANS of Passive and Active Control of Flows Around Generic Vehicle Bodies

Paper in proceedings, 2012

The paper explores how time-dependent numerical techniques, large eddy simulation and Partially-Averaged Navier-Stokes, perform in predicting flow control of generic ground vehicles. Predictions of both passive and active flow control applications are explored. Passive flow control with cylindrical vortex generators was simulated for an Ahmed body with a slanted surface of $25^o$ at the rear end. Active flow control with periodic blowing and suction was applied at the end of a D-shaped body. Both the LES and the PANS were successful in predicting the flow control effect. The LES prediction of the flows around the Ahmed body was in better agreement with experimental observations than PANS. The PANS prediction of the active flow control of the D-shaped body was in good agreement with the LES prediction and the experimental observations. Furthermore, the PANS of the active flow control produced good results on a relatively coarse computational grid, showing the potential of the technique for flow control of higher Reynolds number flows.