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PIV시스템을 이용한 규칙파중 2차원 사각형 부유식 구조물 주위의 유동특성 연구
정광효(KWANG-HYO JUNG),전호환(HO-HWAN CHUN) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.6
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 vicinityof 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 interactionbetween the regular wave and the structure. The results show 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, whichpresents 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.
정광효(Kwang-Hyo Chung),장종희,전호환(Ho-Hwan Chun) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.2
A numerical simulation was done to investigate the performance of thin wings in close vicinity to ground. The simulation is based on Vortex Lattice Method(VLM) and freely deforming wake elements are taken into account for a sudden acceleration case. The parameters covered in the simulation are angle of attack, aspect ratio, ground clearance, sweep angle and taper ratio. In addition, the effect of the wing endplate on the ground effect is included. The wing sections used for present computations are uncambered, cambered and S-types. The present computational results are compared with other published computational results and experimental data.
정광효(Kwang-Hyo Jung),서성부(Sung-Bu Suh),박성부(Sung-Boo Park) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
This study is to calibrate the surface flow accelerator to make a uniform vertical velocity distribution. This experiment is carried out circulating water channel with employing PIV technique. The vertical and horizontal velocity distributions are illustrated for two different impeller rpm with varying surface flow accelerator rpm. This experimental approach suggests how to measure, the velocity uniformity near free surface. Also, the velocity uniformity could be quantified in direction vertical and horizontal.