Numerical Simulation of Flow around a Circular Cylinder with Sub-systems

摘要

When the coefficient Re≥ 47, the flow of fluid through a certain structure gradually becomes unstable. At that time, periodic vortices were formed in the behind of the structure. They will interact with each other, causing the flow of fluid oscillate in a periodic way. This can cause intense structural vibrations and even structural damage. One of the techniques to reduce structural vibration is to use sub-systems to change the flow structure. In this research, immersed boundary method is applied to investigate the effect of controlling the flow through the circular cylinder by using various sub-systems. The survey model consists of: attaching 2 splitter plates to behind of the circular cylinder, placing 2 rotating controllers having cross-shape to behind of the circular cylinder. The results showed that the lift and drag force acting on the circular cylinder are significantly decreased for both models. In addition, the effect of controlling the flow of the two models will be compared and find the most optimal model.