RANDOM WAVE FORCES ON HORIZONTAL CYLINDERS

The random wave induced in-line and transverse forces on a smooth circular cylinder, placed horizontally near a plane boundary, are analysed in the time domain. Time histories of instantaneous water surface elevation and the corresponding in-line and transverse forces are Fourier decomposed into various frequency components. Time histories of water particle kinematics for different frequency components are generated using the linear numerical wave component and the in-line hydrodynamic coefficients of inertia and drag are evaluated by the Morison equation and least-squares method. The in-line root mean square (r.m.s.) coefficients are also obtained. Component transverse forces are analysed in terms of maximum and r.m.s. transverse force coefficients. All in-line and transverse force transfer coefficients are correlated with the component Keulegan-Carpenter number or period parameter, gap ratio of the cylinder from the plane boundary and depth parameter. The component force transfer coefficients are compared with regular wave force experiments and the coefficients obtained from the time domain analysis of the entire length of the instantaneous random water surface elevation and corresponding force records.

• Supplemental Notes:
  • Ocean Engng, v 17 n 5, 1990, p 447 [16 p, 21 ref 8 fig]
• Authors:
  • Subbiah, K
  • Cheong
  • H-F Shanakar, N J
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Cylindrical bodies; Force; Waves
• Uncontrolled Terms: Random waves
• Old TRIS Terms: Wave forces on structures
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00698941
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM