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MODELLING ROUGHNESS AND RECEPTIVITY IN THREE-DIMENSIONAL BOUNDARY LAYERS

David Tempelmann
Linné FLOW Centre, SeRC, KTH Mechanics, SE-100 44 Stockholm, Sweden

Lars-Uve Schrader
Department of Mechanical Engineering University of Ottawa, ON, Canada K1N 6N5

Ardeshir Hanifi
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden; Swedish Defence Research Agency, FOI, SE-164 90 Stockholm, Sweden

Luca Brandt
Linné Flow Centre, KTH Mechanics, Osquars backe 18, SE-100 44 Stockholm, Sweden

Dan S. Henningson
Linne FLOW Centre and Swedish e-Science Research Centre (SeRC) KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden

Аннотация

The receptivity of a swept-wing boundary layer to localised surface roughness is studied by means of direct numerical simulations (DNS). The flow case considered is meant to model wind tunnel experiments performed at the Arizona State University by Saric & coworkers. The receptivity amplitude of the crossflow disturbances predicted by the DNS is 40% of that measured in the experiments. The DNS results are then used to evaluate the performance of different receptivity models based on either the parabolised stability equations or the finite Reynolds number theory (FRNT). In general it is found that receptivity amplitudes are well predicted for micron sized roughness elements if non-parallel effects are accounted for.