Flow visualization experiments on stably stratified flow over ridges and valleys |
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| Authors: | J T Lee R E Lawson Jr G L Marsh |
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| Institution: | (1) Present address: Atmospheric Sciences Group, Earth and Space Sciences Division, Los Alamos National Laboratory, MS-D466, 87545 Los Alamos, NM, USA;(2) Present address: Meteorology and Assessment Division, Atmospheric Sciences Research Laboratory, U. S. Environmental Protection Agency, 27711 Research Triangle Park, NC, USA;(3) Present address: Northrop Services, Inc., 27709 Research Triangle Park, NC, USA |
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| Abstract: | Summary Flow visualization experiments on stably stratified flow over ridges and valleys formed by a pair of ridges were conducted in a large towing tank filled with stratified salt water. The ambient flow was normal to the axis of the ridges. Three experimental parameters were varied during the study: the steepness of the ridges, the separation distance between the ridges and the Froude number. The flow field in the valley was strongly influenced by flow separation from the lee side of the upstream ridge. For the gentle and intermediate ridges with maximum slopes of 13° and 27°, this separation was controlled by the lee waves when their wavelength was less than or equal to the width of the ridge. The flow field in the valley was similar to that downstream of a single ridge. For the steep ridge with a maximum slope of 40°, separation from the lee side of the upstream ridge and the flow field in the valley were influenced significantly by the presence of the downstream ridge.With 13 FiguresOn assignment from the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. |
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