Record Display for the EPA National Library Catalog


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
Additional 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 Last
NTIS  PB88-195987 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
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.