배열에 따른 두 원주 주위 유동장 해석

Many researches were done on the flow field analysis around two adjacent cylinders. A lot of applications can be found in many fields, such as, mechanical engineering, aerospace engineering, wind engineering, and ocean engineering. This research aims at the ocean engineering applications. Most of the ocean structures are consisted of cylindrical bodies. Thus the interaction between them is very important phenomenon to be analyzed. Zdravkovich (1985) published a paper concerning the interaction effects between two adjacent cylinders, in side by side and tandem arrangements. His research was done in the wind tunnel. He presented the sketch of the classification of flow regimes. In this study the velocity vector fields were obtained by using the particle image velocimetry. The details of the velocity field information were obtained. The experiment was done in the 2D wave flume. The flow fields were visualized by using laser beam sheet first. Then the high speed camera recorded the flow fields. The results are transferred to the computer. Noise reduction was done on the input frames of images. After labelling of traces, the center of gravity were calculated. Then the particle identification was done by two frame method. Finally, the flow fields were obtained. In this paper we attempt to find out the difference phenomenon for wave existence or non-existence in the flow field.