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dc.contributor.authorCresswell, D.
dc.date.accessioned2021-12-24T17:35:13Z
dc.date.available2021-12-24T17:35:13Z
dc.date.issued2021
dc.identifier.citation

Cresswell, D. (2021) 'Scale model behaviour and float geometry influence on an oscillating water column system', The Plymouth Student Scientist, 14(2), pp. 279-310.

en_US
dc.identifier.urihttp://hdl.handle.net/10026.1/18507
dc.description.abstract

A numerical model based on a 1:60 scale Lazy-S Mooring Line has been developed using the dynamic analysis software OrcaFlex, to determine the software’s capabilities when analysing discretized scale models, and to quantify the effect that varying float surface geometry has on mooring line system damping. Static analysis was performed, followed by dynamic analysis, based on experimental data from physical testing in the University of Plymouth 35m Sediment Flume tank, against two distinct float shapes with equivalent hydrostatic properties but aspect ratio variance perpendicular to fluid flow. The impact of scale modelling on static line forces, effective tension and driving frequency were evaluated as a comparative base between the experimental and numerical findings, and the intricacies of scale modelling evaluated in the context of the OrcaFlex software. Evaluation of Static Line Forces (SLF) finds that systems comprised of taut lines at scale can misinterpret line tension as constant and may not exhibit expected static and dynamic tension behaviour, theorized as due to the nodal method OrcaFlex adopts for calculating line tension. Dynamic analysis of driving frequency amplitude suggests an agreement of behaviour between data sets – i.e, a reduced surface area results in a greater driving frequency of tension loading, particularly in the Heave direction of Oscillating Water Column (OWC) motion – based on the original defined float types and a proposed plate of 30% greater drag area. Drag area was determined to have a reduced influence at higher frequencies due to motion lag within the system such that, as OWC motion scales past a certain threshold, optimisation of float geometry will yield diminishing returns. Consequently, evaluation of results suggests that numerical scale modelling in OrcaFlex is an appropriate method for modelling behaviour as a function of changing hydrostatic properties, but that consideration must be made when modelling taut scale systems to limit potential numerical discrepancies.

en_US
dc.language.isoenen_US
dc.publisherUniversity of Plymouthen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.subjectOrcaFlexen_US
dc.subjectscale modellingen_US
dc.subjectnumerical modellingen_US
dc.subjecthydrodynamicsen_US
dc.subjectmooring linesen_US
dc.subjectbuoyancy moduleen_US
dc.subjectfloaten_US
dc.subjectOWCen_US
dc.subjectoscillating water columnen_US
dc.subjectshallow wateren_US
dc.subjectLazy-Sen_US
dc.subjectHeaveen_US
dc.subjectSurgeen_US
dc.titleScale model behaviour and float geometry influence on an oscillating water column systemen_US
dc.typeArticleen_US
plymouth.issue2
plymouth.volume14
plymouth.journalThe Plymouth Student Scientist


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Attribution 3.0 United States
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