Low-Froude-number stable flows past mountains

Hunt, J. C. R. and Feng, Y. and Linden, P. F. and Greenslande, M. D. and Mobbs, S. D. (1997) Low-Froude-number stable flows past mountains. Il nuovo cimento C, 20 C (3). pp. 261-272. ISSN 1826-9885


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A new approximate analysis is presented for stably stratified flows at low Froude number F past mountains of heightH. In the “top” layer where the streamlines pass above the surface of themountain, there is a perturbation flow. This approximately matches the lower flow in the “middle” ‘horizontal’ layer [M] in which the streamlines pass round the mountain in nearly horizontal planes, as in Drazin’s (DRAZIN P. G., On the steady flow of a fluid of variable density past an obstacle, Tellus, 13 (1961) 239-251) model. The pressure associated with the diverging streamlines on the lee side of the summit layer flow drives the separated flow in the horizontal layer (which is not included in Drazin’s model). This explains the vortical wake flow in experiments and in the “inviscid” computations of Smolarkiewicz and Rotunno (SMOLARKIEWICZ P. K. and ROTUNNO R., Low Froude number flow past three-dimensional obstacles. Part I: Baroclinically generated lee vortices, J. Atmos. Sci., 46 (1989) 1154-1164). A method for estimating the height HT FH of the cut-off mountain is derived, as a function of upstream shear, mountain shape and other parameters. Recent laboratory experiments have confirmed how the curvature of the oncoming shear flow profile (

Item Type: Article
Uncontrolled Keywords: Boundary layer structure and processes; meteorology; rotational flow and vorticity; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.5 Meteorologia (Classificare qui l'atmosfera) (Classificare la previsione e le previsioni di specifici fenomeni meteorologici in 551.64; classificare la Micrometeorologia in 551.66)
Depositing User: Marina Spanti
Date Deposited: 11 May 2017 08:28
Last Modified: 11 May 2017 08:28
URI: http://eprints.bice.rm.cnr.it/id/eprint/11999

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