Numerical analysis of mass ratio effects on vortex-induced vibration for a single-degree-of-freedom circle cylinder at high Reynolds numbers
Vortex-induced vibration analysis provides a crucial theoretical basis for wind resistance research and engineering application for the flexural structures.Vortex-induced vibration is one of the main subjects in structural wind engineering field.The vortex-induced vibration of a circular cylinder system at high Reynolds numbers and high mass ratios is numerically simulated based on unsteady Reynolds-averaged Navier-Stokes equations(URANS)methods.The improved SST k-ω turbulence model is employed,and fluid-solid interaction is achieved by dynamic meshing technique.The structure motion equation is solved using the Newmark-β method.The characteristics of transverse oscillation of the cylinder are analyzed.Simulations are conducted over a Reynolds number range from 1.39×104 to 1.04×105,and the corresponding reduced velocities ranging from 2 and 12.This paper calculates the VIV responses of the cylinder under different reduced velocities.The vortex-induced vibrations of the circular cylinder with different mass ratios under different reduced velocities are calculated.The variations of oscillation amplitude ratio,vibration frequency ratio,and lifting coefficient with different mass ratio and different high Reynolds number are discussed.The characters of vibration amplitude responses and vortex shedding patterns under the above conditions are also analyzed.The results indicate that the numerical results align well with existing experimental data;the Reynolds number and mass ratio have significant effects on the vortex-induced vibration of the cylinder,providing valuable insights for further analysis of vortex-induced vibrations in cylinders.
万方数据
维普
