Wave Forces on Partially Submerged Cylinders

by A. Graham Dixon, Research Asst.; Dept. of Civ. Engrg., Salford Univ., England; formerly, Research Student, Edinburgh Univ., Edinburgh, Scotland,
Stephen H. Salter, Reader; Dept. of Mech Engrg., Edinburgh Univ., Edinburgh, Scotland,
Clive A. Greated, Dir.; Fluid Dynamics Unit, Dept. of Physics, Edinburgh Univ., Edinburgh, Scotland,

Serial Information: Journal of the Waterway, Port, Coastal and Ocean Division, 1979, Vol. 105, Issue 4, Pg. 421-438

Document Type: Journal Paper


Morison's equation for wave force is adapted to predict the force exerted by regular waves on a partially submerged horizontal cylinder. In particular, the vertical force equation is modified by introducing a buoyancy term and a varying volume after first discarding the drag term. Some experimental data taken in a 30-cm wide tank are used to calculate a value of the inertial coefficient Cm using a least squares fitting procedure. Although a spread is found in the values of Cm, it is suggested that the theoretical value for a submerged cylinder, Cm=2.0, could be used with some success.

Subject Headings: Wave equations | Wave forces | Submerging | Cylinders | Vertical loads | Buoyancy | Inertia | Least squares method

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