Computational Analysis of Actuation Techniques Impact on the Flow Control around the Ahmed Body

Active flow control with jet devices is a promising approach for vehicle aerodynamics control. In this work an extended computational study performed comparing three different actuation strategies active around the square back Ahmed body at Reynolds number 500,000 (based on height). Numerical simulations are run using Large Eddy Simulation (LES) approach, well adapted to calculate unsteady high periodic devices. computations validated in-house experiments uncontrolled and some controlled cases. The novelty of investigation mainly related in-depth base approaches by accurate LES method their comparison experiments. Here, several estimate effect controls topology drag reduction. Beside continuous blowing jet, techniques including suction as zero flux synthetic explored. slots implemented discontinuously in order achieve better efficiency linked vortex generation. framework, spectral analyses global aerodynamical quantities, rear pressure/drag coefficient behavior examination wake structure investigations compare these actuations. As result, shear layer variations observed during phase, but main change occurs jets. Rear pressure therefore substantially increased.