ADDED MASS AND DAMPING FORCES ON CIRCULAR CYLINDERS

A series of experiments was performed to determine the fluid added mass and damping forces on harmonically oscillating cylinders in still water. The forces obtained in this case are simply related to the forces which would occur if the cylinder was stationary and the fluid oscillated with the same amplitude and frequency. Hence, the results have direct bearing on the calculation of wave forces on cylindrical structures. Primary attention is given to low amplitude motions where it is found that the fluid damping force is purely viscous (proportional to the velocity). Beyond an oscillation amplitude of 0.4 dia, the damping becomes proportional to velocity squared in agreement with previous investigations and common assumption. The added mass is found to be independent of amplitude and well represented by linear theory for the experimental conditions.

• Supplemental Notes:
  • Prepared for ASME Meeting, September 19-24, 1976.
• Corporate Authors:

  American Society of Mechanical Engineers

  Two Park Avenue
  New York, NY  United States  10016-5990
• Authors:
  • Skop, R A
  • Ramberg, S E
  • Ferer, K M
• Publication Date: 1976-9

Media Info

• Features: References;
• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Coefficients; Cylindrical bodies; Force; Mass; Oscillation; Waves
• Old TRIS Terms: Added mass; Oscillating bodies; Oscillation | damping; Wave forces on structures
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00148569
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: Pap N76-Pet-3
• Files: TRIS
• Created Date: Feb 23 1977 12:00AM