Flow Around Horizontal Circular Cylinder in Shallow Flows
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 117, Issue 2
Abstract
This paper describes changes to the flow pattern around a horizontal circular cylinder immersed in shallow open‐channel flows, with different gap openings between the cylinder and the bed. Experiments show that the low flow depth causes backup of the upstream flow depth due to choking of the flow. This phenomenon causes the occurrence of a weir‐flow condition at the cylinder, where a large drawdown forms. The net result is an increase of the drag force. When a gap is present between the underside of the cylinder and the bed, the oncoming flow divides itself into two components as it approaches the cylinder. The study presents a unique relationship describing the amount of gap flow as a function of the undisturbed flow depth and gap size. Changes to both the drag and lift forces exerted on the cylinder for different flow depth and gap size combinations were measured and reasons for these changes discussed.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Bagnold, B. A. (1974). “Fluid forces on a body in shear‐flow: Experimental use of stationary flow.” Proc. R. Soc. London Ser. A, 340, 147–171.
2.
Bakhmeteff, B. A. (1912). Varied flow in open channel. St. Petersburg, Russia.
3.
Bearman, P. W., and Zdravkovich, M. M. (1978). “Flow around a circular cylinder near a plane boundary.” J. Fluid Mech., 89(1), 33–47.
4.
Carpenter, L. H. (1958). “On the motion of two cylinders in an ideal fluid.” J. of Res. Nat. Bur. Standards, Paper 2889, 61(2), 83–87.
5.
Forbes, L. K., and Schwartz, L. W. (1982). “Free‐surface flow over a semicircular obstruction.” J. Fluid Mech., 114(1), 299–314.
6.
Fredsøe, J., and Hansen, E. A. (1987). “Lift forces on pipelines in steady flow.” J. Wtrway., Port, Coast, and Oc. Engrg., ASCE, 113(2), 139–155.
7.
Grass, A. J., Raven, P. W. J., Stuart, R. J., and Bray, J. A. (1983). “The influence of boundary layer velocity gradients and bed proximity on vortex shedding from free spanning pipelines.” Proc. 15th Offshore Tech. Conference, OTC 4455, Houston, Texas, May 2–5, 103–108.
8.
Henderson, F. M. (1966). Open channel flow. Macmillan Publishing Co., Inc., New York, N.Y., 27–60.
9.
Jensen, B. L., and Sumer, B. M. (1986). “Boundary layer over a cylinder placed near a wall.” Prog. Report 64, Inst. Hydrodynamics and Hydr. Engrg., Technical University of Denmark, Lyngby, Copenhagen, Denmark, 31–39.
10.
Zdravkovich, M. M. (1985). “Forces on a circular cylinder near a plane wall.” Appl. Ocean Res., 7(4), 197–201.
11.
Zdravkovich, M. M., and Kirkham, A. J. (1982). “Modelling interference between a subsea pipeline and seabed.” Proc. Int. Conf. on the Hydr. Modelling of Civ. Engrg. Structures, BHRA Fluid Engineering, Cranfield, Bedford, England, 339–348.
Information & Authors
Information
Published In
Copyright
Copyright © 1991 ASCE.
History
Published online: Mar 1, 1991
Published in print: Mar 1991
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.