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dc.contributor.authorHu, Z
dc.contributor.authorMai, T
dc.contributor.authorGreaves, Deborah
dc.contributor.authorRaby, Alison
dc.date.accessioned2017-09-25T13:36:17Z
dc.date.available2017-09-25T13:36:17Z
dc.date.issued2017-11
dc.identifier.issn0889-9746
dc.identifier.issn1095-8622
dc.identifier.urihttp://hdl.handle.net/10026.1/9984
dc.description.abstract

This paper describes numerical and laboratory investigations that have been carried out to gain a better understanding of the physical processes involved in offshore breaking wave impacts on a large offshore structure. The findings are relevant to offshore and coastal structures and to identifying the extreme loads, peak pressures and maximum run-up needed for their design. A truncated wall in a wave flume is used to represent a vertical section of an FPSO (Floating Production Storage and Offloading) hull, which is a typical large offshore structure. Four types of wave impact were identified in the tests, and are referred to as slightly-breaking, flip-through, large air pocket and broken wave impacts. Physical modelling was undertaken in Plymouth University's COAST Laboratory and the open source Computational Fluid Dynamics (CFD) package-Open Field Operation and Manipulation (OpenFOAM) was adopted to study focused wave generation and wave impact on the hull. The method solves incompressible Unsteady Reynolds-averaged Navier–Stokes Equations (URANSE) using a finite volume method with two phase flows. A Volume of Fluid (VoF) interface capturing approach is used to model the free surface. A NewWave boundary condition is used to generate focused wave groups based on the first plus second-order (hereafter second-order) Stokes wave theory in the Numerical Wave Tank (NWT). By changing the focus location with respect to the wall, the wave impact type was altered in both the numerical and laboratory investigations. The results show that for the four wave impact types tested good agreement was achieved between numerical predictions and experimental measurements of surface elevation, run up and impact force. The peak pressures predicted by the simulation are lower than the experimentally measured results due to time step constraints, although the shape of the pressure time history is very similar. Four distinct wave impact types are identified for the vertical hull section and are found to be similar in character to those observed for a full depth vertical wall. The predicted force on the hull is found to be greatest for the large air pocket impact, and the highest run-up for the slightly-breaking wave impact. The pressure records show a high degree of spatial and temporal variation though the highest pressure recorded at any location was due to flip-through. This research has shown that different characteristic wave impact types are responsible for maximum load and greatest wave run-up and so need to be considered separately for design purposes.

dc.format.extent99-116
dc.languageen
dc.language.isoen
dc.publisherElsevier BV
dc.subjectOpenFOAM Focused wave groups
dc.subjectBreaking waves
dc.subjectNonlinear k - epsilon model
dc.subjectAir entrainment
dc.subjectImpact pressure
dc.titleInvestigations of Offshore breaking Wave Impacts on a large offshore Structure
dc.typejournal-article
dc.typeJournal Article
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000414113000006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.volume75
plymouth.publication-statusPublished
plymouth.journalJournal of Fluids and Structures
dc.identifier.doi10.1016/j.jfluidstructs.2017.08.005
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Admin Group - REF
plymouth.organisational-group/Plymouth/Admin Group - REF/REF Admin Group - FoSE
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Engineering, Computing and Mathematics
plymouth.organisational-group/Plymouth/PRIMaRE Publications
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA12 Engineering
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Marine Institute
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
plymouth.organisational-group/Plymouth/Users by role/Researchers in ResearchFish submission
dcterms.dateAccepted2017-08-09
dc.rights.embargodate2018-11-01
dc.identifier.eissn1095-8622
dc.rights.embargoperiod12 months
rioxxterms.funderEPSRC
rioxxterms.identifier.projectA Zonal CFD Approach for Fully Nonlinear Simulations of Two Vessels in Launch and Recovery Operations
rioxxterms.versionofrecord10.1016/j.jfluidstructs.2017.08.005
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/under-embargo-all-rights-reserved
rioxxterms.licenseref.startdate2017-11
rioxxterms.typeJournal Article/Review
plymouth.funderA Zonal CFD Approach for Fully Nonlinear Simulations of Two Vessels in Launch and Recovery Operations::EPSRC
plymouth.funderA Zonal CFD Approach for Fully Nonlinear Simulations of Two Vessels in Launch and Recovery Operations::EPSRC


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