VERTICAL HYDRODYNAMIC FORCES ON TRUNCATED HOLLOW CYLINDERS
Following previous work for truncated solid cylinders (Wengel et al 1994), parametric studies were conducted on a series of single truncated hollow cylinders in deep water (infinite water depth) using linear potential theory. Simplified formulae were fit to the results so that the time domain analyses could be performed on spar buoys (including the effects of a moon pool) using Morison's equation with the proper representation of the vertical hydrodynamic forces at the base of the buoy. Non dimensional diffraction forces (amplitude and phase) and radiation coefficients were obtained and plotted for the vertical (heave) direction. Cylinder aspect ratios, defined as the ratio of the outer diameter D to the draft H (D/h), ranging from 0.05 to 1.6 were considered. The ratios of the inner to outer radius (b/a) of the cylinders studies were 0.2, 0.4, 0.6, and 0.8 (0.0 would be a solid cylinder). The results were plotted versus the scatter parameter ka over the range from 0.025 to 5.0, where k=2pi/L is the wave number, L is the incident wave length, and "a" is the outside cylinder radius. Simplified formulae were then fitted to the results in order to obtain approximate expressions which could be used in practice.
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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 206 [10 p, 10 ref, 26 fig]
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Authors:
- Weggel, D C
- Roesset, J M
- Publication Date: 1995
Language
- English
Subject/Index Terms
- TRT Terms: Cylindrical bodies; Diffraction; Force; Waves
- Uncontrolled Terms: Hollow structures
- Old TRIS Terms: Wave diffraction; Wave forces on structures; Wave radiation
- Subject Areas: Marine Transportation; Materials;
Filing Info
- Accession Number: 00733769
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Mar 27 1997 12:00AM