Wave Forces on Cylinders Near Plane Boundary

by Tokuo Yamamoto, (A.M.ASCE), Res. Engr.; School of Engrg., Oregon State Univ., Corvallis, OR,
John H. Nath, (F.ASCE), Prof.; Dept. of Mech. Engrg./Oceanography and Dir. of Envir. Fluid Lab., Oregon State Univ., Corvallis, OR; also, Prin., Nath-Eager and Assoc., Corvallis, OR,
Larry S. Slotta, (M.ASCE), Prof.; Dept. of Civ. Engrg. and Dir. of Ocean Engrg. Program, Oregon State Univ., Corvallis, OR,

Serial Information: Journal of the Waterways, Harbors and Coastal Engineering Division, 1974, Vol. 100, Issue 4, Pg. 345-359

Document Type: Journal Paper

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.

Subject Headings: Wave forces | Wave velocity | Cylinders | Domain boundary | Pipe flow | Potential flow | Boundary layers | Professional societies |

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