In this paper, the finite volume method is used to simulate vortex-induced motion of four circular columns. The vortex-induced motion system of four circular columns is simplified into spring-mass-damping model. Reynolds-Averaged Navier-Stokes solver combined with the SST (Shear-Stress Transport) k-ω turbulence model for the Navier-Stokes equation has been used to simulate the vortex induced motion at low mass ratio. Fourth order Runge-Kutta method was manually written into the User Defined Functions to solve the dynamic response of four circular columns, and then dynamic mesh technology was adopted to resolve the coupling fluid structure interaction. It is found that the amplitude of the four circular columns first increase and then decrease with the increase of reduced velocity, ‘jump’ phenomenon is observed in the amplitude curve at the reduced velocity of 9.0. The transverse maximum amplitude appeared at reduced velocity of 8.0, the value is 1.99D, which is much larger than the stream-wise maximum amplitude, 0.26D. In-line balance position of square column didn’t always increase with the increase of reduced velocity, it suddenly decreases at the reduced velocity of 9.0 and then increase. Frequency lock-in phenomenon is found on the study of four circular columns vortex-induced motion, the lock-in region is at the reduced velocity of 5.0-8.0. When the vortex-induced system passed the lock-in region, stream-wise and transverse amplitude suddenly decrease. Finally, the trajectory and vortex shedding pattern of four circular columns at different velocities are discussed.
Key words
four circular columns /
vortex-induced motion /
frequency lock in /
dynamic mesh
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