Abstract
This study carries out a numerical simulation about changes of the lock-in phenomenon of the single circular cylinder which is oscillating in the direction of a flow. As for the calculation method of this study, the vortex method was used. The calculation was carried out by Reynolds number Re= 500. The oscillating amplitude ratio was 2a/d = 0.25 and the range of oscillating frequency ratio f/fK was 0 to 3. In order to know the reliability of the calculation method, the flow aspect and fluid force of the stationary single circular cylinder were investigated, and it compared with the existing experimental result. The result was well in agreement. Also in calculation of the oscillating single circular cylinder, two typical flow patterns when a lock-in occurs were expressed. The relationship of the drag and lift was also found. The aspects of the flow of the situation which the lock-in does not produce were investigated. In the situation which the lock-in does not produce, there is no particular flow pattern and it became clear that two typical vortex shedding configurations interchanged and appeared. It was found that the character of such a complicated flow can also be expressed by the vortex method.
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