Record Display for the EPA National Library Catalog

RECORD NUMBER: 20 OF 35

OLS Field Name OLS Field Data
Main Title Flow Visualization Experiments on Stably Stratified Flow over Ridges and Valleys.
Author Lee, J. T. ; Lawson, R. E. ; Marsh, G. L. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. ;Los Alamos National Lab., NM. ;Northrop Services, Inc., Research Triangle Park, NC.
Year Published 1987
Report Number EPA/600/D-87/048;
Stock Number PB87-145900
Additional Subjects Atmospheric circulation ; Topographic features ; Valleys ; Flow visualization ; Model tests ; Cooling ; Wind(Meteorology) ; Interactions ; Stratification ; Aerodynamics ; Froude number ; Mathematical models ; Ridges
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB87-145900 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 23p
Abstract
A series of flow visualization experiments was conducted in the large towing tank of the EPA Fluid Modeling Facility. The objective of the experiments was to define the flow over a simple cosine-shaped ridge and within a valley formed by a pair of such ridges when there is a stable ambient flow normal to the ridge. Three experimental parameters were varied during the study: the Froude number, the steepness of the ridge, and the separation distance between the ridges. The flow over single ridges was found to be similar to previously published results for isolated hills. The flow within the valley formed by a pair of ridges was dependent upon the steepness of the ridge. For the most gentle ridge, there appeared to be little aerodynamic interaction between the two ridges even at the minimum separation of S/W = 1. The separation tended to be unstable with the flow switching from an attached to a separated condition during the tow.