Wave-induced vibration of a fully submerged horizontal cylinder close to a free surface: a theory and experiment

ABSTRACT

This paper presented theoretical and experimental models for the investigation of the amplitude of the vertical motion of a cylinder by a two-dimensional linear wave, passing through a circular horizontal cylinder close to the free surface in water. To consider the effect of the free surface, the Gap ratio = d/a was introduced by dividing the distance d between the centre of the cylinder and the water surface by the radius a of the cylinder. In this study, the smaller the Gap ratio, the greater the effect of the free surface, and it was theoretically calculated that it caused severe fluctuations in the hydrodynamic coefficients. In particular, by expanding previous studies for the calculation of hydrodynamic coefficients, the oscillating amplitude of the cylinder close to the free surface was proved by experiment.

KEYWORDS:

• Horizontal cylinder
• free surface
• linear wave
• gap ratio
• hydrodynamic coefficient

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No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Dong Min Shin

Prof. Dong Min Shin is Research Assistant Professor, Institute for Security Convergence Research, Korea Advanced Institute of Science and Technology (KAIST) PhD – Korea Advanced Institute of Science and Technology (KAIST), Korea, 2019.

Jaeho Chung

Prof. Jaeho Chung is Research Assistant Professor, Institute for Security Convergence Research, Korea Advanced Institute of Science and Technology (KAIST) PhD – Korea Advanced Institute of Science and Technology (KAIST), Korea, 2018.