Viscous-inviscid interaction and boundary-layer separation in transonic flows (INVITED)

Abstract eng:
This paper is concerned with the behaviour of boundary-layers in transonic flows. When the Reynolds number is large, the interaction between the boundary layer and inviscid flow outside the boundary layer becomes important in many flow situations. These include the flows in a vicinity of the separation point and near body surface irregularities. Even a simple discontinuity in the surface curvature proves to be capable of creating a pressure gradient that is strong enough to cause the boundary-layer separation. Alternatively, small surface imperfections may be arranged in such a way that they would produce a strong favourable pressure gradient, which allows to accelerate the flow in the boundary layer making it more resistant to separation and laminar-turbulent transition. We use asymptotic (large Reynolds number) analysis of the Navier–Stokes equations to describe this flow behaviour.

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