Numerical Simulation of Vortex-induced Vibration for Segmented Cylinders
Keywords:
Computational fluid dynamics, flow around cylinder, large eddy simulation, segmented cylinder, vortex induced vibrationAbstract
Vortex-induced vibration (VIV) becomes one of the engineers' main concerns in designing an optimized riser system. Attached segmented buoyancy modules around the riser pipe could be utilized in reducing the VIV through the elimination of the vortex shedding and increasing the riser's fatigue life. However, this can only be achieved if the segmented buoyancy modules are properly arranged along the riser. Thus, this research presents the analysis of vortex-induced vibration of bare and segmented cylinders by using ANSYS FLUENT. The simulation was done in 3D at the stationary condition. For this study, three configuration models, namely, the bare cylinder, 27% segmented cylinder and 46% segmented cylinder were investigated. The simulation also includes grid independency test for the bare cylinder to ensure the results generated were reliable. The turbulent model used in this simulation was large eddy simulation (LES), where the vortices created at the back of the cylinder and separation of the flow could be monitored using post-processor. The lift and drag coefficients were simulated by analyzing the flow passes through the cylinder and it was found that the drag coefficients were reduced by 68.29% and 74.05% for the 27 % and 46% segmented cylinders, respectively in comparison to the bare cylinder's value. Meanwhile, the lift coefficients were reduced by 24.61% and 44.27% for the 27% and 46% segmented cylinders, respectively, as compared to the bare cylinder counterpart. Both segmented models experience reduction in the drag and lift coefficients where the buoyancy segments disturbed the vortex shedding at downstream.
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