孔を有する円板まわりの流れ

抄録

The drag force acting on the disk depends on the presence or absence of holes. For example, it is known that the drag coefficient increases when a donut-shaped hole is made in a disk and the hole is enlarged. Therefore, in this study, we created a disk model with 0, 3, 4, and 6 holes, and investigated the effects of the number of holes and aperture ratio on fluid drag. In the experiment, the model was freely dropped in water, and the drag coefficient was derived from the force balance. We also report the results of applying dye to the model and visualizing the flow around the model.