Research Article
Nov 1974
Wave Forces on Cylinders Near Plane Boundary
Authors: Tokuo Yamamoto, AM.ASCE, John H. Nath, F.ASCE, and Larry S. Slotta, M.ASCEAuthor Affiliations
Publication: Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 100, Issue 4
Abstract
Potential flow theory predicts: (1) the added mass of a cylinder near a plane boundary is independent of the direction of the flow and more than twice as large as that of the same cylinder far away from the boundary; (2) a possible failure mechanism of alternating positive and negative lift force, which is proportional to horizontal velocity squared, for pipelines resting on the bottom boundary and subjected to waves and currents; and (3) the force from convective acceleration of the ambient flow can be as large as 30% of total acceleration force for waves. Laminar boundary-layer theory suggests that a phase shift exists between maximum velocity and maximum drag force for cylinders subjected to waves. Laboratory wave force experimentation confirms the aforementioned theoretical findings 1 and 2.
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Published In
Journal of the Waterways, Harbors and Coastal Engineering Division
Volume 100 • Issue 4 • November 1974
Pages: 345 - 359
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Nov 1974
Published online: Feb 12, 2021
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Authors
Affiliations
Tokuo Yamamoto, AM.ASCE
Research Engr., School of Engrg., Oregon State Univ., Corvallis, Oreg.
John H. Nath, F.ASCE
Prof., Dept. of Mech. Engrg./Oceanography and Dir. of Environmental Fluid Lab., Oregon State Univ., Covallis, Oreg.; also Prin., Nath-Eager and Assoc., Corvallis, Oreg.
Larry S. Slotta, M.ASCE
Prof., Dept. of Civ. Engrg. and Dir. of Ocean Engrg. Program, Oregon State Univ., Corvallis. Oreg.
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