HYDRODYNAMIC FORCE ON SMOOTH HORIZONTAL CYLINDER IN UNIFORM OSCILLATORY FLOW

Hydrodynamic forces on a smooth horizontal circular cylinder exposed to oscillating flow were investigated experimentally at Reynolds numbers (Re) in the range 20,000 - 260,000 (subcritical and transcritical regimes) and Keulegan-Carpenter numbers (Kc) in the interval from 5 to 40. In the tests, the Re number and Kc number were varied systematically. The drag force coefficient CD and inertia force coefficient CM in Morison equation were determined through the use of the Least Squares Method. Both total in-line force coefficient CF and transverse force (lift) coefficient CL were analysed in terms of their maximum and root means square values. All the in-line and lift force coefficients were given as a function of Re and Kc number, and also their deviations with the average value were shown. The principal results are as follows: for the Re greater than or equal 80,000m, all the hydrodynamic force coefficients, including CD, CM, CF and CL, are at best very weak functions of Reynolds number, and each of them tends towards a certain constance with increasing Kc number; for the Re 80,000, the drag force coefficient CD decreases with increasing Re number, and inertia force coefficient CM increases with increasing Re number. The tendencies of drag and inertia coefficients versus Kc number for the Re less than or equal 105 are very similar to the others, which are very close to Rodenbusch and Cutierrez's (1983) but are somewhat larger than Sarpkays's (1976 and 1986) and Bearman et al's (1985).

• Supplemental Notes:
  • ISOPE 93, 3rd Intl Offshore & Polar Engng Conf; 6-11 June 1993; Singapore. Sponsored by ISOPE, USA, et al. Procs. Publ by ISOPE, ISBN 1-880653-08-7. Vol III, p 208 [8 p, 20 ref, 16 fig]
• Authors:
  • Kang
  • H-G
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Force; Hydrodynamic pressure; Waves
• Old TRIS Terms: Hydrodynamic forces; Oscillating flow; Uniform slow; Wave forces on structures
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00716275
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Feb 28 1996 12:00AM