Wave Forces on Rough-Walled Cylinders at High Reynolds Numbers

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Author
Sarpkaya, Turgut
Collins, Neil J.
Evans, Steven R.
Date
1977-05Metadata
Show full item recordAbstract
This paper presents the results of an extensive
experimental investigation of the in-line and transverse
forces acting on sand-roughened circular cylinders
placed in oscillatory flow at Reynolds numbers
up to 1,500,000; Keulegan-Carpenter numbers up to 100;
and relative roughnesses from 1/800 to 1/50. The drag
and inertia coefficients have been determined through
the use of the Fourier analysis and the least squares
method. The transverse force (lift) has been analysed
in terms of its maximum and root-mean-square values.
In addition. the frequency of vortex shedding and the
Strouhal number have been determined. The results
have shown that all of the coefficients cited above
are functions of the Reynolds number, Keulegan-Carpenter
number, and the relative roughness height.
The results have also shown that the effect of roughness
is quite profound and that the drag coefficients
obtained from tests in steady flow are not applicable
to harmonic flows even when the fluid loading is
predominantly drag.
Description
9th Annual Offshore Technology Conference (OTC) in Houston, Tex, May 2-5, 1977
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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