Author(s): Mohd Azim Safwan Abdul Wahab, Siti Fatin Mohd Razali
Linked Author(s): Siti Fatin Mohd. Razali
Keywords: VIV suppression, vortex generator, Strouhal number, drag coefficient, lift coefficient
Abstract: Vortex-induced vibration (VIV) is one of the natural phenomena which occur when there is fluid-structure interaction. It will cause the structure to vibrate due to vortex shedding behind the structure. This is because VIV can cause fatigue damage to the marine risers and pipelines. To overcome this problem, suppression of VIV in the offshore industry is an important method to prolong the lifetime of pipelines and risers. One of the methods that can suppress the mechanism of VIV is using passive control devices known as Vortex generator (VGs). In this paper, analysis was conducted on bare cylinder and VGs cylinder using Computational Fluid Dynamic (CFD) simulation using solver of SST k-? turbulent model. Analysis was focused on validation simulation model using Reynolds number, Re 100, 200, 500, and 1000 and were compared with other studies. Then, further simulations were focused on Reynolds number of 6423 and 10000 to obtain lift and drag coefficient and Strouhal number. The comparison of result of force coefficients between simulation of this study and the previous studies showed good agreement. Drag coefficients for bare cylinder are smaller than those of VGs cylinder for all Reynolds number except for Reynolds number of 6423. The case with Re ? 1000 showed the lift coefficients for VGs cylinder are higher than those of bare cylinder
Year: 2017