Response of shear flows to external disturbances Contents: 1. Acoustic receptivity of laminar separating boundary layer 2. Acoustic receptivity of laminar.

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Presentation transcript:

Response of shear flows to external disturbances Contents: 1. Acoustic receptivity of laminar separating boundary layer 2. Acoustic receptivity of laminar micro jet Multimedia files – 7/13

The following examples are visual demonstration of strong effects on the flow pattern which can have external perturbations coupled with the shear-layer instabilities

A video clip by V.V. Kozlov, F.-R. Grosche, A.V. Dovgal, H. Bippes, A.Kühn, H. Stiewitt (DLR, Göttingen, 1993) 1. Acoustic receptivity of laminar separating boundary layer (I) (see page of notes) Click to play

A video clip by V.V. Kozlov, F.-R. Grosche, A.V. Dovgal, H. Bippes, A.Kühn, H. Stiewitt (DLR, Göttingen, 1993) 1. Acoustic receptivity of laminar separating boundary layer (II) Click to play

2. Acoustic receptivity of laminar micro jet (I) (see page of notes) Micro jet (left) forced transversally by acoustic waves (right)

A video clip by Yu.A. Litvinenko, G.R. Grek, V.V. Kozlov, M.V. Litvinenko (2010) 2. Acoustic receptivity of laminar micro jet (II) Click to play