Wave Forces on a Large Structure in the Presence of a Current

Authors

Sung-Shan Hsiao, Associate Professor, Department of Harbor & River Engineering, National Taiwan Ocean University, 2 Pei-Ning Rd. Keelung, Taiwan.
Ming-Chung Lin, Professor, Department of Naval Architecture & Ocean Engineering, National Taiwan University, 73 Chow-Shan Rd. Taipei, Taiwan.

Abstract

The wave forces acting on a large structure in the presence of a current have been investigated numerically. It is noted that the velocity potential in a wave-current coexisting field can be separated into an unsteady wave potential and a steady current potential. The unsteady wave potential with effects of both a uniform current and a large structure was calculated by using boundary element method. The steady current potential can be expressed as the sum of a uniform current and a steady disturbance due to the existence of the structure. This means that current velocity will be changed in the vicinity of the structure. The variation of current velocity around the structure was then calculated by using a surface vorticity method. Substituting both unsteady wave potential and current velocity distribution into the first-order dynamic pressure equation and integrating the pressure over the body surface, the first-order wave forces on a large structure in the presence of a current then can be obtained. Comparison of the present results with those of Matsui et al. (1991) are made. The agreement is satisfactory. The numerical model proposed here has its adaptability to the problem of waves, current and a large structure interactions

Recommended Citation

Hsiao, Sung-Shan and Lin, Ming-Chung (2009) "Wave Forces on a Large Structure in the Presence of a Current," Journal of Marine Science and Technology: Vol. 7: Iss. 1, Article 3.
DOI: 10.51400/2709-6998.2508
Available at: https://jmstt.ntou.edu.tw/journal/vol7/iss1/3