Wave Forces on Rough-Walled Cylinders at High Reynolds Numbers
Collins, Neil J.
Evans, Steven R.
MetadataShow full item record
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.
9th Annual Offshore Technology Conference (OTC) in Houston, Tex, May 2-5, 1977
RightsThis 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.
Showing items related by title, author, creator and subject.
Dynamic Characteristics of Liquid Motion in Partially Filled tanks of Spinning Spacecraft Agrawal, B.N. (1990);This paper presents a boundary layer model to predict dynamic characteristics of liquid motion in partially filled tanks of a spinning spacecraft. The solution is obtained by solving three boundary value problems: inviscid, ...
Cooperative Control of Multiple Space Manipulators Yale, G.; Agrawal, B.N. (1994);This paper concerns the cooperative control of multiple manipulators attached to the same base as they reposition a common payload. The theory is easily applied to inertially based problems as well as space based free-floating ...
Cyber System Assurance through Improved Network Anomaly Modeling and Detection Bollmann, Chad A. (Monterey, California: Naval Postgraduate SchoolMonterey, California. Naval Postgraduate School, 2019-12); NPS-19-N039-AThe objectives of this work were to investigate the source of the dual natures of network traffic (i.e., Gaussian and alpha-stable) in order prove the merit of further development, improvement, and application of non-parametric ...