dc.contributor.author	Mays, Timothy Wayne Jr.	en
dc.contributor.committeechair	Plaut, Raymond H.	en
dc.contributor.committeemember	Rojiani, Kamal B.	en
dc.contributor.committeemember	Liapis, Stergios I.	en
dc.contributor.department	Civil Engineering	en
dc.date.accessioned	2014-03-14T20:48:06Z	en
dc.date.adate	1997-12-19	en
dc.date.available	2014-03-14T20:48:06Z	en
dc.date.issued	1997-12-05	en
dc.date.rdate	1998-12-19	en
dc.date.sdate	1997-12-05	en
dc.description.abstract	For oblique and normal water waves at various frequencies, the use of moored cylinders as breakwaters is considered numerically using linear three-dimensional analysis. The breakwater can be used by itself for protection of small structures or as a series of cylinders to protect a harbor, shoreline, or moored vessel from the destructive energy associated with incident water waves. The breakwater is completely submerged below the free surface and is attached to the ocean floor with six symmetrically configured mooring lines. The cylinder is filled with air and the mooring lines remain taut during the structure's motion. Six degrees of freedom describe the motion of the breakwater and additional degrees of freedom are introduced as the cables are modeled with the use of lumped masses connected with springs. The fluid is assumed to be inviscid and incompressible, so that the velocity field can be written as the gradient of the velocity potential. A boundary integral method is used to solve the integral equations that define the external fluid flow. Free vibrations of the cylinder in both air and water are considered and "dry " and "wet" natural frequencies are computed. Motions caused by water waves are studied to establish the effect of certain parameters on the effectiveness of the breakwater. The transmission coefficient is shown to be somewhat misleading when compared to plots that show the spatial variation of the wave amplitude.	en
dc.description.degree	Master of Science	en
dc.identifier.other	etd-111897-164358	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-111897-164358/	en
dc.identifier.uri	http://hdl.handle.net/10919/35750	en
dc.language.iso	en	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	intro.pdf	en
dc.relation.haspart	ch1and2.pdf	en
dc.relation.haspart	ch3.pdf	en
dc.relation.haspart	ch4.pdf	en
dc.relation.haspart	ch5txt.pdf	en
dc.relation.haspart	ch5figs.pdf	en
dc.relation.haspart	ch6txt.pdf	en
dc.relation.haspart	ch6figa.pdf	en
dc.relation.haspart	ch6figb.pdf	en
dc.relation.haspart	ch7txt.pdf	en
dc.relation.haspart	ch7figs.pdf	en
dc.relation.haspart	ch8.pdf	en
dc.relation.haspart	end.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	Breakwater	en
dc.subject	Cylinder	en
dc.subject	Vibration	en
dc.subject	Wave	en
dc.subject	Mooring	en
dc.title	Three-Dimensional Analysis of Moored Cylinders Used as Breakwaters	en
dc.type	Thesis	en
thesis.degree.discipline	Civil Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	masters	en
thesis.degree.name	Master of Science	en

Three-Dimensional Analysis of Moored Cylinders Used as Breakwaters

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