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Subsonic Boundary Layer Receptivity to Free Stream Acoustic Perturbations
* : Auteur correspondant
Acoustic receptivity of a Blasius boundary layer in the presence of two dimensional surface inhomogeneity is investigated numerically. It is shown that, an efficient conversion of the acoustics input to an unstable eigenmode of the boundary layer depends strongly not only on the shape but also on the width of surface roughness trough the band of Fourier Components. The location of the surface roughness is dictated by the requirement of the instability wave number at the lower branch of the stability curve derived from the Orr-Sommerfeld equations. Three different shapes are considered.
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