Second-Order Wave Forces on Vertical CyLinder

by John N. Hunt, Prof.; Dept. of Applied Mathematics, Univ. of Reading, Whiteknights, England,
Rafik E. Baddour, Lect.; Arab Maritime Transport Academy, Alexandria, Egypt,


Serial Information: Journal of the Waterway, Port, Coastal and Ocean Division, 1982, Vol. 108, Issue 3, Pg. 430-434


Document Type: Journal Paper

Abstract: Second-order diffraction effects are included in evaluating the maximum horizontal forces on a vertical cylinder under a second-order deep water progressive wave. For large cylinders, the values of the maximum horizontal force are significantly higher than are predicted by linear theory due to second-order terms. Current engineering practice for slender cylinders is to compute the maximum horizontal force using fifth-order Stokes theory with a mass coefficient taken from linear theory. It is shown that this gives an adequate approximation to second-order diffraction effects in the maximum horizontal force, to within 5% for the steepest wave. Further examination of these results is encouraged.

Subject Headings: Cylinders | Wave forces | Wave diffraction | Vertical loads | Water waves | Linear functions | Progressive waves | Engineering profession

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