Inlet boundary conditions for incompressible LES: A comparative study

In this paper, a comparison between inlet boundary conditions for Large Eddy Simulation is carried out. The geometry considered is the case n. 83 of the Ercoftac database; an incompressible and fully turbulent flow reaches a wall-mounted hump, that is followed by a separation region with recirculation. Three different inflow boundary conditions (fixed velocity profile, plane mapping and synthetic turbulence inlet) have been tested in an open-source CFD code and their influence on mean flow quantities, such as vortex separation and reattachment points, pressure coefficient and turbulence has been analyzed. Results show a satisfying agreement with experiments for the prediction of the mean pressure coefficient and the vortex separation point, despite which, some discrepancies still exist with respect to the channel velocity profiles, vortex size and reattachment point.