Numerical simulation method for 2-DOF vortex-induced vibration

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (23) : 22-26.

Sun Liping，Zhang Xu，Ni Wenchi

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Abstract

The existing simulation results for 2-DOF vortex-induced vibration are not satisfied, especially, the maximum amplitude estimation of its responses. In tests of Jauvtis & Williamson, the maximum amplitude of a cylinder with a low mass ratio could reach 1.5D, this phenomenon was named “super upper branch”. But, few simulation results of current studies can reach 1.3D even unable to capture super upper branch. The reasons were likely to be defects of the turbulence model itself and the unreasonable setting of numerical simulation parameters. Aiming at the problems mentioned above, an improved k-ε turbulence model was used to study the effect of acceleration on responses of vortex-induced vibration here based on the software OpenFOAM and optimize the numerical simulation method. By analyzing responses of amplitude, phase, trajectory and tail vortex, it was shown that 2-DOF vortex-induced vibration can be numerically simulated more accurately with the improved k-ε turbulence model under appropriate accelerations.

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vortex-induced vibration (VIV) / k-&epsilon / turbulence model / acceleration / numerical simulation

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Sun Liping，Zhang Xu，Ni Wenchi. Numerical simulation method for 2-DOF vortex-induced vibration[J]. Journal of Vibration and Shock, 2017, 36(23): 22-26

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