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Title: Reduction of vortex induced forces and motion through surface roughness control

Abstract

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.

Inventors:
;
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1129081
Patent Number(s):
8,684,040
Application Number:
12/125,409
Assignee:
The Regents of the University of Michigan (Ann Arbor, MI) GFO
DOE Contract Number:  
FG36-05GO15162
Resource Type:
Patent
Resource Relation:
Patent File Date: 2008 May 22
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Bernitsas, Michael M, and Raghavan, Kamaldev. Reduction of vortex induced forces and motion through surface roughness control. United States: N. p., 2014. Web.
Bernitsas, Michael M, & Raghavan, Kamaldev. Reduction of vortex induced forces and motion through surface roughness control. United States.
Bernitsas, Michael M, and Raghavan, Kamaldev. Tue . "Reduction of vortex induced forces and motion through surface roughness control". United States. https://www.osti.gov/servlets/purl/1129081.
@article{osti_1129081,
title = {Reduction of vortex induced forces and motion through surface roughness control},
author = {Bernitsas, Michael M and Raghavan, Kamaldev},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {4}
}

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