RESEARCH PAPERS: Offshore Mechanics

Oscillating Flow About Smooth and Rough Cylinders

[+] Author and Article Information
Turgut Sarpkaya

Mechanical Engineering, Naval Postgraduate School, Monterey, Calif. 93943-5000

J. Offshore Mech. Arct. Eng 109(4), 307-313 (Nov 01, 1987) (7 pages) doi:10.1115/1.3257025 History: Received November 02, 1986; Online October 30, 2009


The lift, drag, and inertia coefficients and the first ten harmonics of the lift force have been determined through the use of four smooth, four sand-roughened, and one marine-roughened cylinders. The length-to-diameter ratio of the smooth and sand-roughened cylinders was kept constant (L/D = 2) in order to determine the effect of coherence length on the force coefficients. The Keulegan-Carpenter number ranged from about 1 to 60 and the Reynolds number from about 2500 to 800,000. The results have shown that (i ) the smooth cylinder data agree quite well with those presented by Sarpkaya [1, 2] and Rodenbusch and Gutierrez [3]; (ii ) the drag and inertia coefficients for rough cylinders (k/D = 1/50) become independent of β (= D2 /vT ) or of the Reynolds number (Re = Um D/ v) for β larger than about 4000; (iii ) the rough-cylinder data agree quite well within those reported by Sarpkaya [2] and show that the effect of roughness is indeed very profound; and (iv ) the rough-cylinder drag-coefficient data of Rodenbusch and Gutierrez [3] are somewhat larger than those obtained in the present investigation.

Copyright © 1987 by ASME
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