Turbulent Boundary Layers Disturbed by Two-Dimensional Bluff Bodies : Characteristics of Mean Velocity Profile

概要

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Mean-flow characteristics of the turbulent boundary layers disturbed by various rectangular cylinders mounted on a plane wall are experimentally investigated. An empirical law for the mean velocity profile originally proposed by Coles was applied to the disturbed flow field of boundary distributions of the characteristic quantities such as Clauser's equilibrium parameter G, profile paramater II, shape factor H, etc. The values of G, II, H and δ*/δ_0 are found to be rather systematically distributed in the order of the height of cylinders, if h(h/δ_0)C_<Dτ> is taken as a streamwise length scale for the disturbed boundary layers so that the mean velocity field can easily be predicted in both transient and redeveloping regions downstream of the cylinders. Here δ_0 is the undistubed boundary-layer thickness at the location of cylinders. Here δ_0 is the nudistubed boundary-layer thickness at the location of cylinders, h is the height of the cylinders and C_<Dτ> is their drag coefficient based on the frictional velocity.
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