Low-frequency oscillations of a partially submerged cylinder of arbitrary shape

Athanassoulis, GA; Kaklis, PD; Politis, CG

dc.contributor.author	Athanassoulis, GA	en
dc.contributor.author	Kaklis, PD	en
dc.contributor.author	Politis, CG	en
dc.date.accessioned	2014-03-01T01:11:10Z
dc.date.available	2014-03-01T01:11:10Z
dc.date.issued	1995	en
dc.identifier.issn	0022-4502	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11570
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0029324012&partnerID=40&md5=1be8c8fa0f0d385e5b7c2a32a9fcd468	en
dc.subject.classification	Engineering, Marine	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Cylinders (shapes)	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Oscillations	en
dc.subject.other	Perturbation techniques	en
dc.subject.other	Problem solving	en
dc.subject.other	Surfaces	en
dc.subject.other	Tensors	en
dc.subject.other	Waves	en
dc.subject.other	Asymptotic solutions	en
dc.subject.other	Floating cylinder	en
dc.subject.other	Low frequency oscillations	en
dc.subject.other	Partially submerged cylinder	en
dc.subject.other	Ships	en
dc.title	Low-frequency oscillations of a partially submerged cylinder of arbitrary shape	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	This paper is concerned with the low-frequency asymptotic solution of the deep-water radiation problem for a partially submerged cylinder of arbitrary (nonsymmetric, non-smooth) shape. A five-term asymptotic expansion of the wave potential is derived which reduces to a three-term expansion when the mean volume flux across the wetted surface of the cylinder vanishes. The former case corresponds to the heaving motion and the latter one to the swaying or rolling motions of a floating cylinder. This expansion is then used to obtain explicit low-frequency asymptotic expansions for all elements of the added-mass and damping tensors, as well as the amplitude and the phase angle of the outgoing waves at infinity. Most of the terms in these expansions are given in terms of simple geometric characteristics (beam, area, and centroid's position) of the immersed part of the cylinder, as well as the formal-limit (omega = 0) added mass. Numerical comparison between the asymptotic results and the ''exact'' ones, obtained by solving numerically the frequency-dependent problem, show that the agreement is satisfactory in the range 0 < omega < 0.5 and, in some cases (e.g., for lateral motions), in 0 < omega < 0.6, where omega is the nondimensional frequency normalized by the beam of the cylinder. (Note that the whole range of interest, up to the high-frequency limit, is about 0 < omega < 2.0.)	en
heal.publisher	Soc of Naval Architects & Marine Engineers, Jersey City, NJ, United States	en
heal.journalName	Journal of Ship Research	en
dc.identifier.isi	ISI:A1995RC29200004	en
dc.identifier.volume	39	en
dc.identifier.issue	2	en
dc.identifier.spage	123	en
dc.identifier.epage	138	en