PIV시스템을 이용한 규칙파중 2차원 사각형 부유식 구조물 주위의 유동특성 연구

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 20; no. 6; pp. 41 - 53
• Main Authors: 정광효(KWANG-HYO JUNG), 전호환(HO-HWAN CHUN)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2006
• Subjects: Regular wave 규칙파; Turbulence 난류; Roll motion 횡요운동; Particle image velocimetry 입자영상유속계; Vortex 와류
• ISSN: 1225-0767; 2287-6715

This experimental study investigated the flow characteristics for regular waves passing a rectangular floating structure in a two-dimensional wave tank. The particle image velocimetry (PIV) was employed to obtain the velocity field in the vicinity of the structure. The phase average was used to extract the mean flow and turbulence property from repeated instantaneous PIV velocity profiles. The mean velocity field represented the vortex generation and evolution on both sides of the structure. The turbulence properties, including the turbulence length scale and the turbulent kinetic energy budget were investigated to characterize the flow interaction between the regular wave and the structure. The results shaw the vortex generated near the structure corners, which are known as the eddy-making damping or viscous damping. However, the vortex induced by the wave is longer than the roll natural period of the structure, which presents the phenomena opposing the roll damping effect; that is, the vortex may increase the roll motion under the wave condition longer than the roll natural period.