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Fluid Dynamics Seminar

Monday, Nov 27th, 2006, 4:15 PM
Cullimore Lecture Hall, Room 611
New Jersey Institute of Technology

Numerical Simulation of Disturbance Waves in Supersonic Flow Over a Blunt Flat Plate

Stefan Maehlmann

Department of Mathematical Sciences, New Jersey Institute of Technology

Abstract

The evolution of disturbance waves in viscous supersonic flow over a blunt flat plate with semicircular leading edge is numerically simulated using a highly-accurate spectral collocation method. The fundamental objective is to provide insight into the physical mechanisms that convert environmental disturbances to boundary-layer instability modes. The unsteady flow solutions are computed by imposing fast acoustic waves at the computational inflow boundary. In addition, the unsteady response of the flow to velocity perturbations introduced via local suction and blowing through a slot in the wall of the blunt flat plate is studied. The results indicate a strong receptivity in the leading-edge region to acoustic disturbance waves in the freestream. A qualitatively similar evolution of instability waves in the boundary layer is obtained by local suction and blowing through the wall downstream of the forcing source.