Oscillating Flow About Two and Three-Dimensional Bilge Keels

[+] Author and Article Information
T. Sarpkaya, J. L. O’Keefe

Mechanical Engineering, Naval Postgraduate School, 700 Dyer Road, Room 339, Monterey, CA 93943

J. Offshore Mech. Arct. Eng 118(1), 1-6 (Feb 01, 1996) (6 pages) doi:10.1115/1.2828796 History: Received October 01, 1994; Revised September 22, 1995; Online December 17, 2007


The paper describes an experimental investigation of the damping provided by bilge keels in an oscillating flow (in a large U-shaped water tunnel). Rectangular and square flat plates were placed adjacent to a solid boundary (with no gap) in order to simulate flow about bilge keels. The single free edge of the rectangular plate and the three free edges of the square plates were beveled to 60-deg angles so as to form sharp edges with included angles of about 60 deg. For comparison, another sharpedged rectangular plate was tested without the wall proximity effects. All plates were held normal to the direction of the ambient flow. The Fourier-averaged drag and inertia coefficients were then calculated as a function of a suitable Keulegan-Carpenter number through the use of the instantaneous force acting on each plate.

Copyright © 1996 by The American Society of Mechanical Engineers
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