Oscillating Flow about Two and Three-Dimensional Bilge Keels

• Main Authors: Sarpkaya, T., O'Keefe, J.L.
• Other Authors: Naval Postgraduate School (U.S.), Mechanical Engineering
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASME 1996
• Subjects: Arctic
• Online Access: https://hdl.handle.net/10945/61972

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. Engineering Division of the National Science Foundation