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Title: Experimental investigation of wave forces on submerged horizontal cylinders
Authors: Khalil, Gazi Md.
Issue Date: Apr-2001
Publisher: NISCAIR-CSIR, India
Abstract: This paper presents the results of an experimental investigation of the wave-induced forces acting on horizontal cylinders submerged beneath water waves with axis parallel to the wave crests. The experiments are carried out in a towing tank of the University of Tokyo. A flap-type wave generator is used to produce regular sinusoidal waves of length 1.57 and 3.14 m. The experiments are performed with a circular cylinder and a rectangular cylinder separately with a view to predicting the effect of geometry of the cylinder on the wave-induced forces. Each cylindrical model is tested at eight different depths of submergence. A multi-component load cell is used for the measurement of forces acting on the submerged cylinder. The measured forces are instantaneously digitized and stored in a transient memory. A personal computer, viz., PC 9801 is installed on the carriage of the towing tank in order to compute the mean forces right at the time of performing the experiments. The time-averaged mean horizontal as well as vertical forces acting on the cylindrical model at various depths of submergence are plotted and then physically interpreted. The results are compared with the available data in the literature. The principal conclusion of this investigation is that the breaking of waves behind a shallowly submerged cylinder is primarily responsible for the generation of non-linear wave forces. The negative drifting force which acts on a shallowly submerged cylinder is a direct consequence of wave-breaking. This drifting force, however, tends to vanish when the cylinder is deeply submerged. The findings of this investigation are expected to be useful in the accurate assessment hydrodynamic loads ac ting on various types of offshore structures.
Page(s): 59-65
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.08(2) [April 2001]

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