{"id":84,"date":"2016-09-14T14:29:12","date_gmt":"2016-09-14T13:29:12","guid":{"rendered":"https:\/\/www.staff.ncl.ac.uk\/narakorn.srinil\/?page_id=84"},"modified":"2022-08-09T20:40:25","modified_gmt":"2022-08-09T19:40:25","slug":"viv","status":"publish","type":"page","link":"https:\/\/www.staff.ncl.ac.uk\/narakorn.srinil\/research\/viv\/","title":{"rendered":"VIV @ FlexNARA"},"content":{"rendered":"
\"Vortices\"<\/a>

Vortices are generated when flows past the cylinder<\/p><\/div>\n

VIV of long flexible cylindrical structures such as marine risers, subsea pipelines, power cables, mooring lines & tethers exhibits several interesting fluid-structure interaction phenomena (e.g. dual resonances, hysteresis, higher harmonics, mode switching, mode sharing, traveling wave, drag amplification<\/em>). When exposed to ocean flows, these slender bodies undergo nonlinear large-amplitude oscillation due to the space-time varying hydrodynamics associated with vortex shedding. Because VIV results in an increased mean drag and high oscillating stress-induced fatigue in long flexible structures, VIV is one of the utmost concerns in deepwater developments.<\/p>\n

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Wave-current water flume at Newcastle University<\/p><\/div>\n

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FlexNARA<\/strong> team has been developing computationally efficient models and analysis tools which have been used to examine a variety of VIV phenomena associated with combined hydrodynamics and structural geometric nonlinearities, see our publications. We have developed an experimental<\/em> framework as below and combined analytical-numerical<\/em> approaches to deal with several VIV problems.<\/p>\n