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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Evolution of a Boundary Layer from Laminar Stagnation-Point Flow towards Turbulent Separation
verfasst von : Bernhard Scheichl, Alfred Kluwick
Erschienen in: Progress in Turbulence III
Verlag: Springer Berlin Heidelberg
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We present the most relevant recent findings that allow for a rational timeaveraged description of laminar-turbulent transition of an incompressible nominally two-dimensional and steady boundary layer along the impermeable surface of a rigid blunt body. Rigorous application of matched asymptotic expansions for sufficiently high values of both the Reynolds number and a turbulence-level gauge parameter shows that the presence of a leading-edge stagnation point is associated with the generation of a turbulent shear layer that exhibits an asymptotically small streamwise velocity deficit. Remarkably, however, the turbulence intensity never reaches its theoretically possible maximum that conforms to fully developed turbulent flow.