VORTEX INDUCED VIBRATION (VIV) SUPPRESSION DEVICE

Abstract

The study of Vortex-induced vibration (VIV) is one of the main concern in designing marine riser system to untapped the oil and gas reserve from the seabed. The VIV phenomenon will cause severe fatigue as well as total damage to the structure. In this paper, the simulation was carried out in two-dimensional involving bare cylinder and cylinder with parallel plates in different lengths and gaps by using ANSYS CFX 16. A circular cylinder of 114mm in diameter with different plate lengths and gaps dimension were used in these simulations. Simulation with a bare cylinder in the Reynolds number range from 5x10^4 to 1x10^5 has been performed to serve as reference. The validation by using the Strouhal number is the common practice for the stationary circular cylinder simulation. The Strouhal frequency obtained from this research was St ≈ 0.2. By having the idea parallel plates attached to the cylinder, it will help the flow separation become streamline as well as reduce the VIV on the marine riser. In addition, the Reynolds numbers are believed will give some significant effect on the behavior of VIV. Results from this paper can be very helpful to design riser system and future endeavor to perform similar kind of simulation.