Transverse forces on smooth and rough cylinders in harmonic flow at high Reynolds numbers
Collins, Neil Jon
MetadataShow full item record
The tranverse forces acting on smoth and san-roughened circular cylinders immersed in an harmonically oscillating flow have been measured using a recently constructed U-shaped water tunnel. The lift coefficient and the frequency of the alternating force have been determined. For smooth cylinders, the lift coefficients were found to depend on both the Reynolds and the Keuglegen-Carpenter numbers for Reynolds numbers between about 20,000 and 150,000. For rough cylinders, the lift coefficients were found to be independent of the Reynolds number within the range of relative roughnesses and Reynolds numbers tested. The results have also shown that the lift coefficients for smooth cylinders at low Reynolds numbers are nearly identical with those obtained for rough cylinders at very high Reynolds numbers at the corresponding amplitude ratios. For both rough and smooth cylinders, the transverse force is a significant fraction of the in-line force and must be taken into consideration in the design of structures. It is recommended that the experiments be extended to the self-excited hydro-elastic oscillations of cylinders in harmonic flows.
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.
In-line and transverse forces on smooth and sand-roughened cylinders in oscillatory flow at high Reynolds numbers Sarpkaya, Turgut (Monterey, California. Naval Postgraduate School, 1976-06-04); NPS-69SL76062This report presents the results of an extensive experimental investigation of the in-line and transverse forces acting on smooth and sand- roughened circular cylinders placed in oscillatory flow at Reynolds numbers up to ...
Henning, Peter John (Monterey, California. Naval Postgraduate School, 1977-03);The transverse forces acting on smooth and sand-roughened circular cylinders immersed in an harmonically oscillating flow have been measured using a recently constructed U-shaped water tunnel. The lift coefficients were ...
Sarpkaya, Turgut (Monterey, California. Naval Postgraduate School, 1978-03); NPS-69SL-78-008The drag and lift forces acting on smooth circular cylinders in an impulsively-started flow have been measured through the use of a vertical water tunnel. The drag and lift coefficients were found to depend on the Reynolds ...