LES of the Flow Around a 2-dimensional Vehicle Model with Active Flow Control

Paper in proceeding, 2010

The technique of large-eddy simulation (LES) was used to study the influence and the resulting flow mechanisms of the active flow control applied on a two-dimensional vehicle geometry. Duplication of a previous experimental study performed with LES was used to verify numerical approach. This was followed with exploration of the influence of flow actuation on the near-wake flow and resulting aerodynamic forces. Not only that a good agreement with the previous experimental study was obtained but also new knowledge was gained in form of complex interaction of the actuation with the coherent flow structures. The resulting time-averaged flow shows strong influence of the extension of the actuation slits and the lateral solid walls on the near-wake flow structures and thereby onto the resulting drag.