NDLI: CFD Calculations of the Vortex-Induced Motions of a Circular-Column Semi-Submersible

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CFD Calculations of the Vortex-Induced Motions of a Circular-Column Semi-Submersible

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Rosetti, Guilherme Feitosa Gonçalves, Rodolfo Fujarra, André Luís Condino Koop, Arjen
Copyright Year	2016
Abstract	The vortex-induced motions (VIM) of offshore platforms stand as an intriguing and challenging engineering problem, drawing attention from industry, universities and research institutes. Field observations, model tests and calculations have extensively showed that the complex fluid-structure interaction can result in appreciable motions and increased fatigue of mooring and risers. It is thus a very relevant issue from the engineering standpoint. A large volume of experimental research has been carried out, mainly to verify designs and characterize the occurrence of VIM. Conversely, the numerical investigations applying CFD tools have shown to be a more flexible approach enabling better understanding of the physics at play due to the possibility of investigating the effects of different parameters upon the vortex induced motions of floating platforms. Moreover, the CFD calculations enable investigation of the full-scale behavior of the platforms under VIM, a very controversial issue presently. Bearing upon these issues, the VIM Joint Industry Project aims at increasing physical insight of this phenomenon by means of investigating the influence of geometric design variations, flow conditions and scale effects with the objective of improving practical knowledge that can be applied in the design stage of floating platforms. In this paper, we present some of the CFD studies, results and observations carried out within the JIP, regarding the VIM of a semi-submersible with circular columns in 0 and 45 degrees and over a wide range of reduced velocities. It is confirmed that the 0 degree incidence results in larger motions than the 45 degrees-incidence case, in contrast to the VIM behavior of a semi-submersible with square columns. The tests campaign carried out at the University of São Paulo for the same platform agree with these results. Within the lock-in range, the frequency synchronization of the lift forces on columns and pontoons cause large net transverse forces. Appreciable sway motions thus result. For larger reduced velocities, synchronization of the flow around the columns cease, but the forces on the pontoons then largely contribute to the total force. In this high-reduced velocity range, the phasing between total force and motion is such that energy transfer from the fluid to the body occurs, causing the amplification of the motions.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791849934
DOI	10.1115/OMAE2016-54987
Volume Number	Volume 2: CFD and VIV
Conference Proceedings	ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2016-06-19
Publisher Place	Busan, South Korea
Access Restriction	Subscribed
Subject Keyword	Computational fluid dynamics Bearings Mooring Locks (waterways) Fatigue Fluid structure interaction Synchronization Flow (dynamics) Physics Design Lift (fluid dynamics) Pipeline risers Energy transformation Fluids Vortices Semi-submersible offshore structures Risers (casting) Offshore platforms
Content Type	Text
Resource Type	Article

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