A study on passive methods of vortex induced vibrations suppression

A number of engineering systems, including those found in offshore operations, are often affected by vortex-induced vibrations (VIV). This phenomenon is caused by the interaction between a structure and shed vortices which can result in large amplitude vibrations of the structure that may lead to severe damage over time. Repairs to these systems are costly and time-consuming. Significant effort has been expended to develop a means of eliminating the need of repairs from vibrations. An investigation was undertaken to find a method of suppressing vortex-induced vibrations of a cylinder in a fluid flow. Passive methods of altering the flow behavior around the structure to mitigate the hydrodynamic forces that cause VIV were considered. Structural enhancements to a cylinder were attempted to accomplish this goal. The study also aimed to reduce drag below that encountered for a bare cylinder in comparable flow in addition to reducing flow induced vibrations. A number of approaches attempted succeeded in accomplishing this goal.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2008

Author dc:creator

• Galvao, Richardo A

Advisor dc:contributor.advisor

• Michael S. Triantafyllou.

• Aeronautics and Astronautics.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/45221

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/45221