HYDRODYNAMIC FORCES ON OSCILLATING AND NON-OSCILLATING SMOOTH CIRCULAR CYLINDERS IN CROSSFLOW

A 12-in-diameter, 6-ft-long cylinder was towed horizontally 4 ft beneath the water surface and perpendicular to the flow. The cylinder was towed at a constant velocity under the following conditions: nonoscillating, oscillating in heave, oscillating in pitch (around the axis of the cylinder), and simultaneously oscillating in pitch and heave. Experimental data on lift, drag, and moment were obtained for Reynolds number from about 100,000 to above 1 million. The results show that the oscillations can significantly influence the magnitude of the lift, drag, and moments. (Author)

• Corporate Authors:

  Naval Ship Research and Development Center

  Bethesda, MD  United States  20034
• Authors:
  • Coder, D W
• Publication Date: 1972-10

Media Info

• Pagination: 93 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Cylindrical bodies; Drag; Drag forces; Engineering moments; Fluid dynamics; Hydrodynamics; Model basins; Oscillation; Reynolds number; Smoothness; Texture; Towing devices; Underwater construction; Underwater structures; Vehicle bodies
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Model testing; Moments; Smooth bodies; Towed bodies
• Subject Areas: Bridges and other structures; Design; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00051151
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NSRDC-3639 Final Rpt
• Files: TRIS
• Created Date: Feb 28 1974 12:00AM