transition to turbulence in swept-wing flows has resisted correlation iwth linear theory because of its sensitivity to freestream conditions and 3-D roughness and because one of the principal instability modes quickly becomes nonlinear.In the face of such a formiadble problem,two rather long-term fundamental efforts have been underway at DLR Gottingen and Arizona State University that address swept-wing transition.These efforts have been recently reviewed by Bippes (1997) and Reibert & saric (1997).The present work is a continuation of studies on swept-wing boundary layers.In particular,we have taken advantage of the sensitivity to 3-D roughness and the modal nature of the instability in order to propose a particular control strategy.
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