A Study on the Behavior of Flexible Riser for Upwelling Deep Ocean Water by a Numerical Method

J. Ocean Eng. Technol. 2004;18(4):15-22.

JUNG DONG-HO;KIM HYEON-JU;PARK HAN-IL;

Ocean Development System Laboratory, KORDI/KRISO;Ocean Development System Laboratory, KORDI/KRISO;Division of Ocean Development Engineering, Korea Maritime University;

수치해석적 방법을 통한 해양심층수 취수용 유연 라이저의 거동 해석에 관한 연구

정동호;김현주;박한일;

한국해양연구원 해양개발시스템연구본부;한국해양연구원 해양개발시스템연구본부;한국해양대학교 해양개발공학부;

Keywords: Deep Ocean Water, Flexible Riser, Static and Dynamic Analysis, Finite Difference Method, Intake Depth

핵심용어: 해양심층수, 유연라이저, 정적 및 동적 해석, 유한차분법, 취수수심

Abstract

Static and dynamic analyses of a very flexible and light riser, for upwelling the deep ocean water, is performed. In this numerical study, an implicit finite difference algorithm is employed for three-dimensional riser equations. Fluid non-linearity and bending stiffness are considered and solved, using the Newton-Raphson iteration. Maintaining the depth of end point of a flexible and light riser is very important for upwelling deep ocean water in a floating type development system. Weight is attached at the end point of the riser in order to maintain its intake depth. It is designed under the strong surface current and the configuration of the rise is predicted. In the dynamic analysis, the tension variation at the top point of the riser is presented. T e results of this study can contribute to the design of the development system in floating type for upwelling deep ocean water.