Experimental and numerical investigation of the slowly varying wave exciting drift forces on a restrained body in bi-chromatic waves

Fonseca, N; Pessoa, J; Mavrakos, S; Le Boulluec, M

dc.contributor.author	Fonseca, N	en
dc.contributor.author	Pessoa, J	en
dc.contributor.author	Mavrakos, S	en
dc.contributor.author	Le Boulluec, M	en
dc.date.accessioned	2014-03-01T02:01:59Z
dc.date.available	2014-03-01T02:01:59Z
dc.date.issued	2011	en
dc.identifier.issn	00298018	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29284
dc.subject	Bi-chromatic waves	en
dc.subject	Difference frequency forces	en
dc.subject	Experimental work	en
dc.subject	Potential flow methods	en
dc.subject	Second order forces	en
dc.subject	Slowly varying forces	en
dc.subject	Water depth effects	en
dc.subject	Wave exciting forces	en
dc.subject.other	Bi-chromatic waves	en
dc.subject.other	Difference frequency	en
dc.subject.other	Experimental work	en
dc.subject.other	Second orders	en
dc.subject.other	Slowly varying forces	en
dc.subject.other	Water depth effects	en
dc.subject.other	Wave exciting forces	en
dc.subject.other	Mooring	en
dc.subject.other	Numerical methods	en
dc.subject.other	drift behavior	en
dc.subject.other	experimental study	en
dc.subject.other	geometry	en
dc.subject.other	Green function	en
dc.subject.other	shallow water	en
dc.subject.other	testing method	en
dc.subject.other	water depth	en
dc.subject.other	water flow	en
dc.subject.other	water wave	en
dc.title	Experimental and numerical investigation of the slowly varying wave exciting drift forces on a restrained body in bi-chromatic waves	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.oceaneng.2011.09.017	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.oceaneng.2011.09.017	en
heal.publicationDate	2011	en
heal.abstract	The paper presents an experimental and numerical investigation of the first order and slowly varying wave exciting forces on a body of simple geometry which is restrained from moving. Both monochromatic waves and three sets of bi-chromatic waves corresponding to three difference frequencies were tested. The depth effects on the second order forces are assessed by repeating the wave conditions for deep water, intermediate water depth and shallow water. The wave exciting mean drift forces and second order slowly varying forces were successfully measured and identified. However, since the magnitude of these forces is small compared to the global forces measured, there is some dispersion in the second order results. The experimental data is compared with three state of the art numerical methods which are able to compute the first and second order wave exciting forces. Two of the methods use Greens function panel methods (Wamit and HydroStar) and the third is based on an analytical solution (Diffrac-R). All methods compute the full second order solution, including the effects related to the quadratic interactions of first order quantities and to the second order diffraction potentials. © 2011 Elsevier Ltd. All rights reserved.	en
heal.journalName	Ocean Engineering	en
dc.identifier.doi	10.1016/j.oceaneng.2011.09.017	en
dc.identifier.volume	38	en
dc.identifier.issue	17-18	en
dc.identifier.spage	2000	en
dc.identifier.epage	2014	en