Combination of the immersed boundary method with compact schemes for DNS of flows in complex geometry
Résumé
We present a direct forcing method better suited for the use of compact finite difference schemes in Direct Numerical Simulation. The new forcing creates inside the body an artificial flow preserving the no-slip condition at the surface but reducing the step-like change of the velocity derivativesacross the immersed boundary. This modificationis shown to improve results both qualitatively and quantitatively for conventional and complex flow geometries.