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INTERACTION OF ACOUSTIC WAVES AND ROUGHNESS ELEMENTS IN A THREE-DIMENSIONAL BOUNDARY LAYER

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Acoustic receptivity of distributed micron-sized roughness elements is investigated for a swept-wing boundary layer by means of direct numerical simulations (DNS) and parabolised stability equations (PSE) computations. The geometry and flow configuration follow experiments and DNS calculations. Acoustic wave has been modeled by superposing a periodic fluctuation ε cos(ωt) to the inflow streamwise velocity component. A range of amplitudes and frequencies are considered to perform simulations and to study acoustic wave-roughness elements interaction.

Author(s):

Nima Shahriari    
KTH Royal Institute of Technology, Department of Mechanics, Linne Flow Centre, SeRC, SE-100 44 Stockholm
Sweden

Ardeshir Hanifi    
KTH Royal Institute of Technology, Department of Mechanics, Linne Flow Centre, SeRC, SE-100 44 Stockholm & Swedish Defence Research Agency, FOI, SE-16490 Stockholm
Sweden

Dan Henningson    
KTH Royal Institute of Technology, Department of Mechanics, Linne Flow Centre, SeRC, SE-100 44 Stockholm
Sweden