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Flow Characteristics Around a Body Under Turbulent Boundary Layer

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Document pages: 3 pages

Abstract: By using atmospheric wind tunnels in which atmospheric boundary layers like those typical of the field situation were simulated, flow comparisons have been made for an unusually wide Reynolds number range. Neutrally stable atmospheric boundary layers were simulated using the classical ‘roughness + castellated fence + mixing grid’ method, with specific design (and cube sizes) chosen to ensure that values of the more important salient parameters characterizing the upstream flow were as close as possible to those of the field situation. An order of magnitude variation in Re was achieved in the two tunnels, whist keeping all upstream flow variables constant; the field situation provides a further order of magnitude. Using measurements of mean and fluctuating surface pressures and velocities just above the top of the cube, it will be demonstrated that Re effects on the mean flow are relatively small whereas the effects on fluctuating pressures and velocities are much more significant. The results will be discussed in terms of the influence of the spectral content of the upstream flow and modelling implications will also be addressed.

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