R. Hernandez and L. Bellon, proceedings of the Décimo Congreso Chileno de Ingeniería Mecánica – COCIM 2002, Santiago de Chile, 15-18 October 2002
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We report experimental results on the large scale vortex dynamics behind bluff bodies in cross flow inside a wind tunnel. Near wake velocity and surface pressure readings at high Reynolds number confirm a periodic shedding. An adaptive averaging technique allows to compute the instantaneous pressure fluctuating field synchronized to the associated vortex shedding cycle, thus enabling a coherent lift and drag computation. Flow imaging through light scattering from smoke wire particles using a rapid ccd camera allowed to record the inner structure of the fluctuating boundary layer at the separation point, as well as the near wake.
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