Abstract
This paper presents a dual study performed in order to compare the influences of both thin and thick flat plate manipulators on turbulent boundary layers. Mainly, the same features are observed for both configurations. In the thick ribbon configuration, a larger wake with a stronger momentum defect induces a quicker initial Cf reduction and a longer relaxation length. Broadly, the components of the Reynolds stress tensor show the same evolution. Moreover, the structures of both manipulated boundary layers are quite comparable. Large scale suppressions throughout the layer and the injection of small scale structures by the ribbon wake are observed on the u´ spectra. The space-time correlation coefficient contours reveal that the longitudinal and vertical integral scales are dramatically reduced by the manipulation, whilst the spanwise integral scale is almost unchanged. However, the spanwise organization of the structures of the manipulated boundary layer is quite modified. The analysis of the spectra and space-time correlation coefficient contours reveals that, at a given streamwise position, the perturbation induced by the thicker ribbon is at an earlier stage in its evolution than the other one. Finally, from a structural point of view, the manipulated boundary layers have a surprisingly long memory.
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© 1989 Springer-Verlag Berlin Heidelberg
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Lemay, J., Savill, A.M., Bonnet, JP., Delville, J. (1989). Some Similarities Between Turbulent Boundary Layers Manipulated by Thin and Thick Flat Plate Manipulators. In: André, JC., Cousteix, J., Durst, F., Launder, B.E., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73948-4_17
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DOI: https://doi.org/10.1007/978-3-642-73948-4_17
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