The Effect of Surface Heating on Hill-Induced Flow Separation |
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Authors: | Huw W. Lewis Stephen D. Mobbs Simon B. Vosper Andy R. Brown |
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Affiliation: | (1) Institute for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, UK;(2) Present address: Met Office, Fitzroy Road, Exeter, EX1 3PB, UK |
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Abstract: | A series of two-dimensional mixing length model simulations of boundary-layer flow over idealised ridges of varying steepness are conducted to investigate the effect of surface heating on flow separation. The relatively simple numerical approach used permits characterisation of the influence of heating for a variety of initial conditions and parameter values. For steep terrain, increased surface heating is shown to enhance the strength and extent of hill-induced separation. For more moderate terrain, a critical heating strength is required for a given hill width and background flow speed before separation is initiated. Sensitivity tests show the results to be insensitive to model parameters or the choice of mixing length. The results are accounted for using a scaling analysis in terms of a non-dimensional stability parameter. |
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Keywords: | Boundary layer Convection Hills |
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