Evaluation of the viscous drag for a domed cylindrical moored wave energy converter

dc.contributor.authorBhinder, Majid A.
dc.contributor.authorMurphy, Jimmy
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2019-04-29T14:50:48Z
dc.date.available2019-04-29T14:50:48Z
dc.date.issued2019-04-25
dc.date.updated2019-04-29T14:42:19Z
dc.description.abstractViscous drag, nonlinear in nature, is an important aspect of the fluid–structure interaction modelling and is usually not taken into account when the fluid is assumed to be inviscid. Potential flow solvers can competently compute radiation damping, which is related to the radiated wave field. However, the drag damping primarily related to the viscous effects is usually neglected in the radiation/diffraction problems solved by the boundary element method (BEM), also known as the boundary integral element method (BIEM). This drag force can have a significant impact in the case of structures extending much deeper below the free surface, or for those that are completely submerged. In this paper, the drag coefficient Cd was quantified for the heave and surge response of a structure which consists of a moored horizontally oriented domed cylinder with two surface piercing square columns located at the top surface. The domed cylinder is the primary part and is submerged. The drag coefficient is estimated using the experimental measurements related to harmonic monochromatic wave–structure interaction. Finally, this estimated drag coefficient was used in the modified time domain model, which includes the nonlinear viscous correction term, and the resulting device response in heave and surge directions is presented for an irregular incoming wave field. The comparison of the numerical model and the experiments validates the estimated Cd values obtained earlier. Prior to the time domain model, frequency-dependent parameters such as added mass, radiation damping, and excitation force were computed using three mainstream potential flow packages (that is, ANSYS AQWA, WAMIT, and NEMOH), and a comparison is presented. The effect of free surface on the drag coefficient is investigated through differences in Cd values between heave and surge modes.en
dc.description.sponsorshipScience Foundation Ireland (SFI Research Centre for Marine and Renewable Energy Ireland (MaREI))en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid120en
dc.identifier.citationBhinder, M. A. and Murphy, J. (2019) 'Evaluation of the Viscous Drag for a Domed Cylindrical Moored Wave Energy Converter', Journal of Marine Science and Engineering, 7(4),120 (17 pp). doi: 10.3390/jmse7040120en
dc.identifier.doi10.3390/jmse7040120en
dc.identifier.eissn2077-1312
dc.identifier.endpage17en
dc.identifier.issued4en
dc.identifier.journaltitleJournal Of Marine Science And Engineeringen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/7819
dc.identifier.volume7en
dc.language.isoenen
dc.publisherMDPIen
dc.relation.urihttp://www.mdpi.com/2077-1312/7/4/120
dc.rights© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectWAMITen
dc.subjectNEMOHen
dc.subjectANSYS AQWAen
dc.subjectNumerical modellingen
dc.subjectMorison equationen
dc.subjectViscous dragen
dc.subjectWave-structure interactionen
dc.titleEvaluation of the viscous drag for a domed cylindrical moored wave energy converteren
dc.typeArticle (peer-reviewed)en
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