Abstract
The paper addresses the prediction of disturbance amplitudes and profiles due to localized surface roughness and wall-suction in incompressibl e swept-wing boundary layers subject to cross flow (CF) instability. An accurate and efficient numerical approach for solving the receptivity problem of disturbance generation is presented. The solution method developed models correctly the far-field effects of surface roughness and suction through holes on the disturbances generated. This is shown by studying Swept Hiemenz and Falkner-Skan-Cooke (FSC) boundary layer flows as well as a swept-wing experiment. The numerical results for these flows are compared with local receptivity (residue) theory, with data from Direct Numerical Simulation (DNS) and from measurements, respectively. It turns out that local theory strongly overpredicts both receptivity and effects of surface curvature. Due to the account for effects of surface curvature and weak nonlinearity as well as the potential of coupling the results with NOLOT/PSE-methods, the approach presented is a useful numerical tool for designing active and passive transition control systems for swept wings.
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