Research Article
May 1980
Drag of Yawed Pile Groups at Low Reynolds Numbers
Authors: David J. Ball and Clifford D. HallAuthor Affiliations
Publication: Journal of the Waterway, Port, Coastal and Ocean Division
Volume 106, Issue 2
Abstract
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.
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Published In
Journal of the Waterway, Port, Coastal and Ocean Division
Volume 106 • Issue 2 • May 1980
Pages: 229 - 238
Copyright
© 1980 American Society of Civil Engineers.
History
Published in print: May 1980
Published online: Feb 12, 2021
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Authors
Affiliations
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
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