Wave forces on a submerged sphere by bichromatic waves

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:260391

Mizutani, Norimi; Iwata, Koichiro ^[1]

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1. Nagoya Univ. (Japan). Dept. of Civil Engineering

This paper discusses experimentally the wave forces acting on a submerged sphere due to bichromatic waves. Discussion is centered on the drag and inertia coefficients of the Morison equation, determined by the least square method. In the analysis, two interpretations of the drag and inertia coefficients are determined. One set determined is for each wave determined by the zero-downcrossing method while the other set is for whole waves in a wave train. Based on the results, it is shown that the time variation of wave height plays an important role on the wave forces for zero-downcrossing waves. The maximum wave force and the inertia coefficient of the waves whose heights are increasing are larger than those corresponding to waves whose heights arc decreasing. Differences of the drag coefficient between the waves in these two stages are also recognized, however, tendencies depend on flow separation. The differences of these quantities become large with increasing variation coefficient of wave height and decreasing correlation coefficient of wave height of successive waves, and it is pointed out that the effect of irregularity in the wave train should be taken into consideration for accurate estimation of wave forces.

• OSTI ID: 260391
• Report Number(s): CONF-950604--; ISBN 1-880653-19-2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DYNAMIC LOADS
FLUID-STRUCTURE INTERACTIONS
MATHEMATICAL MODELS
OFFSHORE PLATFORMS
RESEARCH PROGRAMS
RESPONSE FUNCTIONS
SUPPORTS
WATER WAVES
WAVE FORCES