Leading-edge receptivity to free-stream vorticity of streamwise corner-flow

Abstract

The receptivity of a streamwise corner-flow configuration with super-elliptical leading edges is investigated by means of direct numerical simulations. For this purpose, vortical perturbations are induced into the computational domain upstream of the leading edge to study the influence of frequency and wave obliqueness on perturbation amplification and pattern formation. Additionally, we investigate the flow response to artificial homogeneous and isotropic free-stream turbulence. It is found that the near-corner region is particularly sensitive to vortical disturbances aligned with the free-stream, and prone to the formation of anti-symmetric disturbance patterns that lead to high local amplification levels.