Abstract
The flow around surface-mounted obstacles placed in a turbulent channel flow (Re = 105 ) has been experimentally studied with the aim of determining separation and reattachment patterns and to investigate the major flow differences between two- and three-dimensional geometries. Obstacles of square cross-section and half channel height were studied while varying the cross-channel width between that of a cube and a two-dimensional rib. Surface flow patterns were obtained to study the flow topology. A two-component laser Doppler anemometer (LDA) was used to gain detailed information about the time-averaged and time-resolved turbulence parameters.
The results of this study lead to a picture of the flow pattern over a surface-mounted cube with quantitative data describing the mean and fluctuating velocity field. Major differences between the two- and three-dimensional flow patterns are identified, both upstream and downstream of the obstacle. Analysis of the time-dependent behaviour reveals a distinct unsteadiness of the upstream flow field for three-dimensional obstacles, which also leads to large contributions to the Reynolds shear stress.
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© 1993 Springer-Verlag Berlin Heidelberg
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Larousse, A., Martinuzzi, R., Tropea, C. (1993). Flow Around Surface-Mounted, Three-Dimensional Obstacles. In: Durst, F., Friedrich, R., Launder, B.E., Schmidt, F.W., Schumann, U., Whitelaw, J.H. (eds) Turbulent Shear Flows 8. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77674-8_10
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DOI: https://doi.org/10.1007/978-3-642-77674-8_10
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