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Reduction of vortex induced forces and motion through surface roughness control

United States Patent

April 1, 2014
View the Complete Patent at the US Patent & Trademark Office
Roughness is added to the surface of a bluff body in a relative motion with respect to a fluid. The amount, size, and distribution of roughness on the body surface is controlled passively or actively to modify the flow around the body and subsequently the Vortex Induced Forces and Motion (VIFM). The added roughness, when designed and implemented appropriately, affects in a predetermined way the boundary layer, the separation of the boundary layer, the level of turbulence, the wake, the drag and lift forces, and consequently the Vortex Induced Motion (VIM), and the fluid-structure interaction. The goal of surface roughness control is to decrease/suppress Vortex Induced Forces and Motion. Suppression is required when fluid-structure interaction becomes destructive as in VIM of flexible cylinders or rigid cylinders on elastic support, such as underwater pipelines, marine risers, tubes in heat exchangers, nuclear fuel rods, cooling towers, SPAR offshore platforms.
Bernitsas; Michael M. (Saline, MI), Raghavan; Kamaldev (Houston, TX)
The Regents of The University of Michigan (Ann Arbor, MI)
12/ 125,409
May 22, 2008
GOVERNMENT INTEREST This invention was made with government support under N00014-03-1-0983 awarded by the Office of Naval Research and DE-FG36-05GO15162 awarded by the Department of Energy. The government has certain rights in the invention.