Drag of Yawed Pile Groups at Low Reynolds Numbers

by David J. Ball, Lect. in Civ. Engrg.; Simon Engrg. Labs., Univ. of Manchester, Manchester, England,
Clifford D. Hall, Asst. Area Engr.; British Waterways Board, England,

Serial Information: Journal of the Waterway Port Coastal and Ocean Division, 1980, Vol. 106, Issue 2, Pg. 229-238

Document Type: Journal Paper


The hydrodynamic drag on square arrays of model cylindrical piles in the Reynolds number range of 250 to 750 is shown to be a function of the angle of yaw of the incident flow and is also related to a parameter termed the normalized projected area. The drag coefficient of a pile group increases as the number of piles is reduced and as the pile spacing is increased and may be greater than the measured single-pile value of 0.94 in the velocity gradient flow. The date suggest that the replacement of a structure consisting of a large number of small-diameter piles by an equivalent group of fewer larger diameter piles will reduce disturbance of the flow field and thus reduce siltation and ship-mooring forces.

Subject Headings: Piles | Pile groups | Reynolds number | Drag (fluid dynamics) | Flow measurement | Hydrodynamics | Hydrologic models | Parameters (statistics)

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