Periodic flow about bluff bodies
Subtitle: part 1: Forces on cylinders and spheres in a sinusoidally oscillating fluid
By: [by] Turgut Sarpkaya [and] Olcay Tuter
Contributors: Tuter, Olcay; Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1974
Place of publication: Monterey, Calif
Language: eng
Number of pages: 89
Subjects: Oscillations; Fluid dynamics; Frictional resistance (Hydrodynamics)
Description: The in-line and transverse forces acting on cylinders and the in-line force acting on spheres placed in a sinusoidally oscillating fluid have been measured.  The periodic flow was generated in a u-shaped vertical water channel through the use of a pneumatic oscillator  The drag, inertia and the lift coefficients as well as the total force coefficient have been determined through the use of Fourier analysis and found to depend on a period parameter.  The results have shown that the transverse force acting on a cylinder in a periodic flow with zero mean velocity is as large as the in-line force.  The frequency of the alternating transverse force depends on a period parameter and several frequencies may occur during  a given period of oscillation of the flow.  It is recommended that the experiments be extended to Reynolds numbers as large as 10^6 in a similar but larger apparatus.  (Author)
Notes: Title from cover.

"Prepared for: National Science Foundation, Washington, D.C. 20550"--Cover.

"September 1974"--Cover.

"NPS-59SL74091"--Cover.

"Technical report for period September 1973-1974."

Author(s) subject terms:Oscillating flow, wave forces, drag and inertia coefficients, cylinders and spheres in an oscillating flow.

Part of the results have been presented at the 14th International Conference on Coastal Engineering, Copenhagen Denmark, June 24-28, 1974.

Includes bibliographical references (p. 86-89)

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1974.