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Velocity scales for constrained flows

Published online by Cambridge University Press:  04 July 2016

A. S. Ramamurthy ,
P. M. Lee  and
G. P. Ng
A. S. Ramamurthy
Affiliation:
Civil Engineering Department, Sir George Williams University, Montreal
P. M. Lee
Affiliation:
Civil Engineering Department, Sir George Williams University, Montreal
G. P. Ng
Affiliation:
Civil Engineering Department, Sir George Williams University, Montreal
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Extract

Two-dimensional flow past a bluff body can be constrained under two important circumstances. For single models, the side walls of a testing facility can impose a constraint on the flow past the model. On the other hand, for single row configurations the adjacent members impose a constraint on the flow past an intermediate member of the row. Both these effects are a consequence of boundary interference.

Ealier investigations related to the interference effects of side walls on the vortex shedding frequency and drag coefficient of single bluff bodies were limited to weakly constrained flows. Recently, side wall interference effects have been reported for severely constrained two-dimensional flows past normal plates, inclined plates, triangular prisms and circular cylinders Constraint or blockage for two-dimensional flow is defined as the ratio of the model width to the test section width. While defining blockage for single rows of bodies, the width of the test section has to be replaced by the spacing between adjacent rows of bodies.

Type
Technical notes
Information
The Aeronautical Journal , Volume 79 , Issue 769 , January 1975 , pp. 38 - 41
Copyright
Copyright © Royal Aeronautical Society 1975 

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References

1. Glauert, H. Wind tunnel interference of wings, bodies and air screws. ARC, R & M 1566, 1933.Google Scholar
2. Maskell, E. C. A theory of blockage effects on bluff bodies and stalled wings in a closed wind tunnel. ARC, R & M 3400, 1957.Google Scholar
3. Fage, A. and Johansen, F. C. On the flow of air behind an inclined flat plate of infinite span. Proc Roy Soc A. Vol 116, 1927.Google Scholar
4. Fail, R. et al.Low speed experiments on the wake characteristics of flat plates normal toan air stream. ARC, R & M 3120, 1957.Google Scholar
5. Shaw, T. L. Steady flow past flat plate in channel. J Hyd Div, Proc ASCE. Vol 95, pp 2013–2018, 1969.Google Scholar
6. Shaw, T. L. Effect of side walls on flow past bluff bodies. J Hyd Div, Proc ASCE. Vol 97, pp 65–79, 1971.Google Scholar
7. Tozkas, A. Effectof confining wallson the periodic wake of cylinders and plates, MS Thesis, Dept of Engg Mechs and Hydraulics, Univ of Iowa. 1965.Google Scholar
8. Abernathy, F. H. Flowover an inclined plate. PhD Thesis, Div of Appl Physics, Harvard Univ, Mass. 1958.Google Scholar
9. Shaw, T. L. Wake dynamics of two-dimensional struc tures in confined flows. Proceedings of the 14th Congress of International Association of Hydraulic Research. Vol 2, Paris, pp 41–48, 1971.Google Scholar
10. Toebes, G. H. and Ramamurthy, A. S. Lift and Strouhal frequency for bluff shapes in constricted pass ages. Proceedingsof the Conference on Flow Induced Vibration in Nuclear Reactors. Agronne Natl Lab, Illinois, pp 225–247, 1970.Google Scholar
11. Ramamurthy, A. S. and Ng, C. P. Steady force coef ficients including blockage effects, toappear in J Eng Mechs, ASCE, 1973.Google Scholar
12. Chen, Y.S. Effect of confining walls on the periodic wake of 90° wedges.Deptof Engg Mechs and Hy draulics. Univ of Iowa, 1967.Google Scholar
13. Modi, V. J. and El-sherbiny, S. Effect of wall confine ment on aerodynamics of stationary circular cylinder. Proceedings of the International Conference on Wind Effects on Buildings and Structures. Tokyo, pp 11-19-1-11-19-12.1971.Google Scholar
14. Spivak, H. M. Vortex shedding frequency and flow pat terns in the wake of twoparallel cylinders at varied spacing normal to an air stream. J Aero Sci, Vol13, pp 289–301, 1946.Google Scholar
15. Livesey, J. L. and Dye, R. C. F. Vortex excited vibration of a heat exchanger tube row, J Mech Engg Sci, Vol 4, pp 349–352, 1962.Google Scholar
16. Biermann, D. and Herrnstein, W. H. The interference between struts in various combinations.NACA Report, 468, 1933.Google Scholar
17. Mclaren, F. G. et al. The interference between bluff sharp edged cylinders in turbulent flows representing models of two tower buildings close together. Tech Note, Building Science, Vol 6, pp 273–274, 1971.Google Scholar
18. Landweber, L. Flow about a pair of adjacent, parallel cylinders normal to a stream.DTMB Report 485, 1942.Google Scholar
19. Nece, R. E. and Unrue, R. D. Discussion on Resistance of cylindrical piersinopenchannelflow, J Hyd Div Proc ACE, Vol 20, pp 223–228, 1964.Google Scholar
20. Borges, A. R. J. Vortex shedding frequencies of the flow through two row banks of tubes. J Mech Eng Sci, Vol 11, No 5, pp 498–502, 1969.Google Scholar
21. Hsieh, T. Resistance of cylindrical piers in open-channel flow. Hyd Div, Proc ASCE, Vol 91, pp 161–173, 1964.Google Scholar
22. Roberts, B. W. The study flow through a cascade of closely space circular cylinders. J Roy Aero Soc, Vol 70, pp 886–887, 1966.Google Scholar
23. Roshko, A. On the drag and shedding frequency of two dimensional bluff bodies. NASA Tech Note3169, July 1954.Google Scholar