Abstract
In the study, the vortex-induced vibration (VIV) of a cylinder fitted with and without helical strakes is investigated using fluid-structure interaction (FSI) software. The purpose is to predict the VIV characteristic of cylinder fitted with and without helical strakes. Fluid and structural solvers in commercial computational fluid dynamic (CFD) software were implemented as two-way FSI solvers to develop the simulation. A flexible circular cylinder of diameter, D = 0.018 m was tested. The pitch and height of the helical strakes were 10D and 0.10D, respectively. Existing experiment outputs of bare cylinder were used as benchmark to verify the simulated results. In overall, the simulation was able to predict the trend of the amplitude response and the mean drag coefficient. However, a slight over-prediction was noticed. It was also found that the helical strakes was able to reduce up to 60% of the VIV in water.
Highlights
Marine riser, which is one of the important components in the offshore structure, play a crucial role in extracting the hydrocarbon products from undersea drilling site to the oil platform
Since the reviews have shown that fluid-structure interaction (FSI) study on riser is very limited and preliminary, we hope to explore its capability in predicting the vortex-induced vibration (VIV) characteristic of cylinder fitted with and without helical strakes in three-dimension
K-1 based Shear Stress Transport (SST) eddy viscosity turbulence model is chosen as this model considers the turbulent shear stress, which is not accounted in other turbulence model
Summary
Marine riser, which is one of the important components in the offshore structure, play a crucial role in extracting the hydrocarbon products from undersea drilling site to the oil platform. Due to the high cost in constructing the experimental facilities and large aspect ratio of the riser, several factors are usually being constrained in the model testing. This initiates the exploration of fluid-structure interaction (FSI) software in predicting the VIV characteristic of a riser. There is still no published work using FSI simulation to predict the response of cylinder fitted with helical strakes. Since the reviews have shown that FSI study on riser is very limited and preliminary, we hope to explore its capability in predicting the VIV characteristic of cylinder fitted with and without helical strakes in three-dimension. The existing experimental results of bare cylinder – cylinder without fitted with helical strakes [13] will be used as benchmark to validate the simulation outputs
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
