Abstract
The hydrodynamic forces acting on a circular cylinder and a rectangular cylinder undergoing slow drift oscillation in regular waves were investigated experimentally and numerically. Forced oscillation tests with low frequency and large amplitude in regular waves and forced two-harmonic oscillation with combined low and high frequencies were carried out in the experimental study. In the numerical study a finite-difference method was used to simulate viscous flow around a two-dimensional oscillating cylinder. The results of experiments showed that a horizontal rectangular cylinder oscillating slowly in waves has much higher damping coefficients than one oscillating in two-harmonic mode, while the numerical study indicated that such differences in the damping coefficient arise partly from the different effects of one-direction harmonic flow and rotating flow on the vortex shedding caused by the slow drift oscillation.
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References
Pinkster JA (1974) Low-frequency phenomena associated with vessels moored at sea. Society of Petroleum Engineers of AIME, SPE paper No. 4837
Wichers JEW (1982) On the low-frequency surge motions of vessels moored in high seas. OTC paper No. 4437, Houston
Koterayama W, Kyozuka Y, Nakamura M (1987) Motions of OTEC platforms moored in irregular waves and dynamic tensions of mooring lines (in Japanese), Trans West Japan Soc Nav Archit 73:33–43
Nakamura M, Koterayama W, Kyozuka Y (1991) Slow drift damping due to drag forces acting on mooring lines. Ocean Eng 18-4:283–296
Koterayama W, Nakamura M, Hu CH (1994) Slow drift damping force due to viscous force acting on mooring lines and floating structures. Proceedings of BOSS’94 vol 2. Pergamon, MIT. pp 97–112
Koterayama W, Nakamura M (1988) Hydrodynamic forces acting on a vertical circular cylinder oscillating with a very low frequency in waves. Ocean Eng 15-3:271–287
Kinoshita T, Takaiwa K (1989) Slow motion forced oscillation tests in waves of tanker, semi-submersible and box-shape barge models. Proceedings of OMAE 1989 vol 2. Haag, pp 427–434.
Ikeda Y, Fujiwara A (1990) Low-frequency viscous damping force acting on cylinders (in Japanese), J Kansai Soc Nav Archit 213:203–209
Otsuka K, Kiku T, Ikeda Y (1992) Viscous forces acting on a semisubmersible oscillating with low frequency in regular waves. Proceedings of ISOPE’92 vol 3. San Francisco, pp 262–271
Hu CH, Koterayama W (1992) A numerical study on hydrodynamic forces of an oscillating circular cylinder in harmonic flow. J Soc Nav Archit Jpn 172:115–126
Hu CH, Koterayama W (1993) A study on viscous damping forces of a slowly oscillating vertical cylinder in random waves. J Soc Nav Archit Jpn 174:205–210
Koterayama W, Nakamura M, Kyozuka Y (1989) Viscous damping force for slow drift oscillation of the floating structure acting on the hull and mooring lines. Proceedings of OMAE’89 vol 2. Haag, pp 497–503
Harlow FH, Weich JE (1965) Numerical calculation of time-dependent viscous incompressible flow of fluid with free surface. Phys Fluid 8:2182–2190
Thompson JF, Thames FC, Mastin CW (1977) Boundary-fitted curvilinear coordinate systems for solution of partial differential equation on fields containing any number of arbitrary two-dimensional bodies. NASA CR-2729
Sarpkaya T, Isaacson M (1981) Mechanics of wave forces on offshore structures. Van Nostrand Reinhold, New York, pp 97–98
Bearman PW, Downie MJ, Graham JMR et al (1985) Forces on cylinders in viscous oscillatory flow at low Keulegan-Carpenter numbers. J Fluid Mech 154:337–356
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Hu, C., Koterayama, W. Slow drift damping force acting on a horizontal cylinder. J Mar Sci Technol 1, 105–113 (1996). https://doi.org/10.1007/BF02391166
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DOI: https://doi.org/10.1007/BF02391166