轴向板条对海洋立管涡激振动抑振的数值研究

Vortex induced vibration (VIV) is a common fluid-structure interaction phenomenon in the field of marine engineering, which can cause fatigue damage or instability of marine structures. In order to suppress the VIV, a new scheme of longitudinal slats was proposed, and the influence of VIV on the marine risers with longitudinal slats was investigated with a transient computational fluid dynamics (CFD) method. Firstly, the distribution of longitudinal slats is defined; secondly, the Newmark- β method is used to solve the differential equation with two degrees of freedom and UDF for the CFD numerical calculation is compiled. k-ω/SST turbulence model and couple algorithm are used, and the vibration process of risers is simulated by using the dynamic mesh technique. The results show that the longitudinal slats have a remarkable effect on VIV suppression of marine risers. When the number of longitudinal slats is 20 (n=20), the streamwise vibration amplitude will be reduced by 78.57% and the transverse vibration amplitude by 58.10%. The results of the study can provide references for the VIV suppression of marine structures.