A Study of Wave and Current Forces on Cylinders

J. Ocean Eng. Technol. 2001;15(4):14-19.

실린더에 작용하는 파력 및 조류력에 관한 연구

박광동,조효제,구자삼

(주)한진중공업 기본설계부,한국해양대학교 해양시스템공학부,부경대학교 조선해양시스템공학과

Keywords: Morison equation, Diffraction theory, Multiple cylinders, Semisubmersible structure, Wave forces, Current forces

핵심용어: 모리슨방정식, 산란파이론, 복수실린더, 반잠수식구조물, 파력, 조류력

Abstract

In this paper, the wave and current forces acting on cylinders are investigated by theoretical and experimental methods. The models used are one-cylinder, four-cylinder and semi-submersible types. The theoretical investigations are carried out by the Morison equation and three dimensional source distribution method to calculate exciting forces in waves with and without currents. The experimental investigations are carried out in the wave tank which can generate currents in both directions. In these tests, the models have been exposed to the regular waves with and without currents. It is shown that the exciting forces acting on the one-cylinder or four-cylinders can be approximately estimated by the Morison equation and also by the diffraction theory. However, the Morison equation seems to be not appropriate to estimate the exciting forces on the present type of semi-submersible.