Nonlinear Stability and Transition in 3-D Boundary Layers

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The important recent progress in three-dimensional boundary-layer transition research is reviewed with emphasis on the crossflow instability that leads to transition on swept wings with a favorable pressure gradient. Following a brief overview of swept-wing instability mechanisms and the crossflow problem, a summary of the important findings of the 1990s is given. The discussion is presented from the experimental viewpoint, and where appropriate, relevant comparisons with CFD are drawn. The recent research conducted with distributed roughness is described in more detail in order to underscore the latest developments concerning nonlinear effects and transition control.

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