Effect of thermal stratification on the growth of the internal boundary layer |
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Authors: | K. S. Rao |
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Affiliation: | (1) Air Force Cambridge Research Laboratories, Bedford, Mass., USA;(2) Environmental Research and Technology, Inc., 696 Virginia Road, Concord, Mass., USA |
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Abstract: | The growth of a two-dimensional internal boundary layer (IBL), which develops when a neutral or unstably stratified flow over a uniform terrain encounters a step-change in surface roughness, is numerically investigated by a higher-order turbulence closure theory. It is found that the thickness of the IBL increases as ~ xn, where x is the downstream distance from the roughness-transition line. For a given set of upstream conditions, the value of the exponent n depends only on the Monin-Obukhov length L, and it is approximately independent of the roughness-change parameter M = In (z01/z02). At large fetches, increases markedly with increasing instability.NRC-NAS Resident Research Associate at AFCRL, 1973–74 |
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