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 = UmD/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.
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November 1987
Research Papers
Oscillating Flow About Smooth and Rough Cylinders
Turgut Sarpkaya
Turgut Sarpkaya
Mechanical Engineering, Naval Postgraduate School, Monterey, Calif. 93943-5000
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Turgut Sarpkaya
Mechanical Engineering, Naval Postgraduate School, Monterey, Calif. 93943-5000
J. Offshore Mech. Arct. Eng. Nov 1987, 109(4): 307-313 (7 pages)
Published Online: November 1, 1987
Article history
Received:
November 2, 1986
Online:
October 30, 2009
Citation
Sarpkaya, T. (November 1, 1987). "Oscillating Flow About Smooth and Rough Cylinders." ASME. J. Offshore Mech. Arct. Eng. November 1987; 109(4): 307–313. https://doi.org/10.1115/1.3257025
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