LOADING ON A VERTICAL CYLINDER NEAR MEAN WATER LEVEL IN LONG- AND SHORT-CRESTED WAVES

This paper presents the results of an experimental investigation on wave forces on a vertical cylinder in the splash zone. The cylinder was subjected to long- and short-crested waves corresponding to JONSWAP spectra, and sectional loads were measured on force sleeves up to mean water level. Ambient particle velocities were measured by means of perforated ball velocity metres whose performance in intermittent flow was checked with reference to a Laser Doppler Anemometer. Maximum Keulegan-Carpenter numbers were about 24, and maximum Reynolds numbers about 8.5 x 104. Analysis of the measurements concentrated on determining the effect of wave directionality on loading at mean water level. Comparison with earlier results for the submerged part of the cylinder suggests that in the splash zone directionality leads to stronger attenuation of loading than at lower elevations. The changes in loading are rather greater than those predicted by Dean's (1977) hybrid theory.

• Supplemental Notes:
  • ISOPE 95, 5th Intl Offshore & Polar Engng Conf; 11-16 June 1995; The Hague, The Netherlands. Sponsored by ISOPE, USA et al. Procs. Publ by ISOPE, ISBN 1-880653-19-2. Vol III, p 324 [8 p, 9 ref, 2 tab, 8 fig]
• Authors:
  • Subbiah, K
  • Chaplin, J R
  • Irani, M B
• Publication Date: 1995

Language

• English

Subject/Index Terms

• TRT Terms: Cylindrical bodies; Force; Vortex shedding; Waves
• Old TRIS Terms: Irregular waves; Morison equation; Wave forces on structures
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00733779
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 27 1997 12:00AM