Forces on Cylinders Near a Plane Boundary in a Sinusoidally Oscillating Fluid
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Authors
Sarpkaya, Turgut
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Date of Issue
1976-09
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American Society of Mechanical Engineers (ASME)
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Abstract
The in-line and transverse forces acting on circular cylinders placed near a plane boundary in a sinusoidally oscillating fluid in a U-shaped vertical water tunnel have been measured. The period parameter Um T/D was varied from about 2 to 40, the Reynolds number from 4000 to 25,000, and the gap between the cylinder and the plane boundary from 0.01 D to 1.0D. The drag and inertia coefficients for the in-line force have been determined through the use of the Morison’s equation and the Fourier analysis, least squares method, and a modified least squares method. The transverse force coefficients have been obtained for the forces toward the wall and away from the wall. The results show that the in-line and transverse forces could acquire very large magnitudes and give rise to serious oscillations. For very small values of the period parameter, effects of flow separation become negligible and the inertia coefficient for the in-line force and the lift coefficient for the transverse force approach those predicted by the potential theory.
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Article
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Mechanical Engineering
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Format
3 p.
Citation
Sarpkaya, Turgut. "Forces on cylinders near a plane boundary in a sinusoidally oscillating fluid." Journal of Fluids Engineering 98.3 (1976): 499-503.
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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.