Influence of free surface and bottom on flow around a cylinder. Issue 4 (March 2021) - Chen, Siqin
Abstract: Doing research on vortex-induced vibration (VIV), not only should we do some numerical simulation but also need to experiment. The existence of the free surface and bottom will influence the drag. We analyzed the drag under different velocity of water under different flow fields, then compared the results. The results show that the water depth will influence vortex shedding thus increase the drag. With a decrease of velocity, the effect of drag will be reduced. Nevertheless, it's not always decreasing, when velocity lower than 0.8m/s, the effect would be steady.