Modelling the calmed region behind a spot.
A theoretical model of the laminar 'calmed region' following a three-dimensional turbulent spot within a transitioning two-dimensional boundary layer is formulated and discussed. The flow is taken to be inviscid, and the perturbation mean flow surface streamlines calculated represent disturbances to the basic slip velocity. Available experimental evidence shows a fuller, more stable, streamwise profile in a considerable region trailing the spot, with cross-flow 'inwash' towards the line of symmetry. Present results are in qualitative agreement with this evidence.
Brown
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Department of Mathematics, University College London, Gower Street, London WC1E 6BT, UK. snb@math.ucl.ac.uk
Smith
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FT