파랑하중 조건에서 부유체의 동적 거동 해석과 조파수조 실험의 비교

Abstract

Fluid surfaces are periodically moved up and down by waves. Using this waves, a wave energy generator has been devised to produce electrical energy. However, in order to develop an efficient wave power generation system, most of the designs are dependent on experimental methods, and it takes much time and cost to commercialize them. To solve these problems, simulation of the interaction between the fluid and the floating body, and the development of efficient the floating body through the analytical results is necessary. In order to analyze the interaction between a fluid and a floating body, a relative Morison equation is mainly used in which the fluid force acting on the floating body is calculated and applied as a concentrated load. However in this method, the wave must be assumed to be a regular wave, and the floating body interacting with the fluid can be applied only to a simple shape such as a cylinder. In addition, since the applied load is applied only to the center of mass of the floating body, there is a disadvantage that the motion and posture of the floating body can not be accurately analyzed. In this study, the behavior of floating body under wave load is simulated by using incompressible smoothed particle hydrodynamics(ISPH) technique, which expresses fluid in the form of numerous particles. And a floating body tester was designed to verify the results of the simulation, and the dynamic behavior of the floating body by the wave was measured with a high-speed camera. In addition, compared to the analysis results by the relative Morison equation under the same conditions, and it was confirmed the utility of ISPH techniques.