The generation of peak pressures in separated/reattaching flows

P. J. Saathoff, W. H. Melbourne

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An experimental study was conducted to investigate the occurrence of large negative peak pressures near the leading edge of sharp-edged bluff bodies. Flow visualization experiments with a long flat plate reveal that negative peak pressures are produced when the separated shear layer rolls up to form a large vortex near the surface. The largest peaks occur approximately 0.25XR from the leading edge where XR is the mean reattachment length. Intermittent roll-up of the shear layer occurs in smooth flow as well as in turbulent flow for a model with a long afterbody. Conditional sampling of pressure data increases spanwise correlation length scales. Limited data obtained with a two-dimensional square cylinder with front face normal to the flow demonstrate the importance of accurately modelling turbulence intensity scale in wind tunnel studies of buildings.

Original languageEnglish
Pages (from-to)121-134
Number of pages14
JournalJournal of Wind Engineering and Industrial Aerodynamics
Issue number1-2
Publication statusPublished - 1 Jan 1989

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