| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB88-195987 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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 |
| Cataloging Source |
NTIS/MT |
| Control Number |
817624414 |
| Origin |
NTIS |
| Type |
CAT |
