OLS : Record


Main Title Flow Structure of Recirculating Wake Flows Downwind of Surface-Mounted Bluff Obstacles.
Author Lawson, R. E.; Snyder, W. H.; Hunt, J. C. R.;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. ;Cambridge Univ. (England). Dept. of Applied Mathematics and Theoretical Physics.
Year Published 1987
Report Number EPA/600/D-88/065;
Stock Number PB88-195987
Subjects Cliffs; Turbulent flow; Flow visualization; Wakes; Model tests; Vortices; Wind tunnels; Boundary layer; Barriers; Flow distribution; Circulation; Reynolds number; Diagrams; Reprints; Ink dot technique
Library   Call Number Additional Info Location Date Modified
NTIS PB88-195987 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1988
Collation 8p
Abstract Wind-tunnel tests were conducted to examine the surface and centerplane flow structure downwind of several surface-mounted obstacles immersed in shallow and deep boundary layers for Reynolds numbers on the order of 10 to the fifth power. Observations were made using the ink-dot method of flow visualization wherein dots of soluble ink were placed on the surface to be examined, then, just prior to the tests, dissolved with a thin coating of oil-of-wintergreen. The movement of the resulting ink-tracer under the action of surface stresses produced detailed records of the near-surface flow patterns even in these highly turbulent, recirculating flows. The resulting flow features are shown to be qualitatively similar to those obtained by other investigators using more time-consuming quantitative techniques or less-detailed qualitative techniques. Centerplane flow patterns obtained by the introduction of centerplane splitter plates were found to distort the geometry of the wake flow pattern while maintaining a topologically consistent structure. Small changes in the shape of the body are shown to produce rather dramatic changes in the structure of the recirculating wake downwind of the body.
Supplementary Notes Prepared in cooperation with Cambridge Univ. (England). Dept. of Applied Mathematics and Theoretical Physics.
Title Annotations Reprint: Flow Structure of Recirculating Wake Flows Downwind of Surface-Mounted Bluff Obstacles,
PUB Date Free Form cApr 87
Category Codes 55B; 55D; 46B
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Control Number 817624414
Cataloging Source NTIS/MT
Origin NTIS
Type CAT