Abstract
This work investigates the effect of structural nonlinearity on the oscillations of an offshore riser subjected to vortex-induced vibration. The riser is modelled by a vertical pipe with steady internal flow which has no direct nonlinear influence on the motion of the coupled system of the structure and fluid surrounding it. The only excitation in the model comes from the pressure difference on the riser arising as a result of vortex-shedding behind its cylindrical body. Simulations of dynamical responses in modal space were performed for two similar models in order to show how a weak geometrical nonlinearity influences oscillations of the riser and consequently the lift coefficient governing forcing from external flow. The structure in the first model had purely linear characteristics, while a nonlinear axial strain relation was introduced in the second one. Comparing responses of the two models, it was found that effects the nonlinearity had on the oscillation were considerably greater when internal flow was included in the calculation as opposed to when the riser was an empty pipe.
Original language | English |
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Title of host publication | OCEANS 2007 - Europe |
Publisher | IEEE Explore |
ISBN (Print) | 1424406358, 9781424406357 |
DOIs | |
Publication status | Published - 28 Nov 2007 |
Event | OCEANS 2007: Europe - Aberdeen, United Kingdom Duration: 18 Jun 2007 → 21 Jun 2007 https://www.tib.eu/en/search/id/TIBKAT%3A557478170/ (Link to Conference proceedings from TIB) |
Conference
Conference | OCEANS 2007: Europe |
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Country/Territory | United Kingdom |
City | Aberdeen |
Period | 18/06/07 → 21/06/07 |
Internet address |
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