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A Finite Element Tool for Investigation of Vortex-Induced Vibration of Marine Risers
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Engineering Design and Materials.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

Vortex-induced vibration (VIV) is a major design issue for all deep-water riser systems operating in regions where severe sea currents can be expected. This highly complex phenomenon has resulted in a great deal of experimental work that today's empirical models are based upon. These models are based on frequency domain dynamic solutions and are therefore not directly applicable in a non-linear time domain model. The purpose of the present work is to develop an approach to combine frequency domain models with a time domain analysis software in order to predict VIV, and implement this into a procedure named FEDEM-VIV. A force prediction algorithm is developed to compute VIV response amplitudes with the Newmark time integration algorithm in FEDEM Software. A validation study is carried out to compare the results from FEDEM-VIV with VIVANA - a frequency domain code. Damping due to large amplitude is pragmatically handled. Response shapes are for this reason not well captured, but maximum response amplitudes are in some cases close to VIVANA estimates. High number of iterations will in general over-estimate the response, and high amplitude damping is not predicted well. Dening a lower limit of the excitation coecient for damping, with a low iteration limit showed feasible predictions of the excitation force distribution. Excitation zone predictions in VIVANA and FEDEM-VIV are in good agreement. However, with the simplications in mind, the current approach represents a good solution for a time domain VIV predictor when all the essential hydrodynamical eects are accounted for in FEDEM-VIV.

Place, publisher, year, edition, pages
Institutt for produktutvikling og materialer , 2014. , 64 p.
URN: urn:nbn:no:ntnu:diva-26327Local ID: ntnudaim:10865OAI: diva2:746552
Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2014-09-12Bibliographically approved

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