Research On Vortex-Induced Vibration Of Grouped SLOR

As an important component in the ocean oil and gas exploration, risers are often subject to hostile environmental conditions which can lead to vortex-induced vibration (VIV) easily. With the continuous development of ocean oil and gas exploration, VIV causing fatigue failure of marine risers can not be ignored. At present, most of the recent investigations carried out by the domestic and overseas scholars are mainly focused on singer and bare marine risers by adopting three-dimensional numerical simulation. However, researches on group single line offset risers are rarely found in papers.Firstly, using the method of flow simulation to study four buoyancy. The results show that the drag force coefficient with the incident angle increases, and the result is more than publish 20%, the lift force coefficient as the incident angle increases. So the computational analysis model can be good at the analysis of VIV of the buoyancy of the Grouped SLOR.Numerical simulation is used to investigate VIV of risers with different incidence angle in this paper. The results show that the result of VIV can match the publish result better. The same velocity as the incident angle increases drag force coefficient also increasing; in the same incident angle at different velocity drag force coefficient decreases with the increase of flow rate. The maximum drag coefficient is less than 2 and the maximum lift coefficient is less than 0.9. The drag and lift coefficient has shielding effect when the angle of incidence is 0 degrees and 30 degrees. The drag and lift coefficient is amplification effect when the angle of incidence is 60 degrees and 90 degrees. In addition to the incident angle of 0 degrees mainly in the 2S pattern in other incident angle has no fixed pattern of vortex shedding.