ABSTRAKT

Simulations of a high-subsonic open-cavity flow controlled by a spanwise rod are presented. The 30dB reduction of the peak pressure tone and the reduction by 6dB of the background pressure found in comparable experiments performed at ONERA are retrieved. The injection of deterministic upstream fluctuations in the LES domain is found to be of crucial importance, in contrast with the baseflow case. Reduction of the vortex impingement onto the aft edge of the cavity is confirmed, together with reduction of mass flow rate breathing through the grazing plane. Visual evidence of merging between the Kelvin-Helmholtz-type vortices shed downstream of the fore edge of the cavity and the von Karman vortices shed behind the cylinder is provided. Shocklets downstream of the cylinder are also observed.