WAVE FORCES ON CYLINDERS NEAR PLANE BOUNDARY

Potential flow theory predicts: (1) The added mass of a cylinder near a plane boundary is independent of the direction of the flow and more than twice as large as that of the same cylinder far away from the boundary; (2) a possible failure mechanism of alternating positive and negative lift force, which is proportional to horizontal velocity squared, for pipe-lines resting on the bottom boundary and subjected to waves and currents; and (3) the force from convective acceleration of the ambient flow can be large as 30% of total acceleration force for waves. Laminar boundary-layer theory suggests that a phase shift exists between maximum velocity and maximum drag force for cylinders subjects to waves. Laboratory wave force experimentation confirms the aforementioned theoretical findings 1 and 2.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Yamamoto, T
  • Nath, J H
  • Slotta, L S
• Publication Date: 1974-11

Media Info

• Features: References;
• Pagination: p. 345-359
• Serial:
  • Journal of Waterways, Harbors & Coast Eng Div
  • Volume: 100
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Coefficients; Force; Loads; Mass; Potential flow; Waves
• Old TRIS Terms: Added mass; Wave forces on structures; Wave induced loads
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00084590
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: #10961 Proceeding
• Files: TRIS
• Created Date: May 19 1975 12:00AM