Applied Mathematics and Mechanics (English Edition) ›› 2017, Vol. 38 ›› Issue (3): 363-378.doi: https://doi.org/10.1007/s10483-017-2175-8

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Resonance in flow past oscillating cylinder under subcritical conditions

Renjie JIANG1, Pengjun ZHENG1,2,3   

  1. 1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, Zhejiang Province, China;
    2. National Traffic Management Engineering and Technology Research Centre, Ningbo University Sub-centre, Ningbo 315211, Zhejiang Province, China;
    3. Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies, Nanjing 210096, China
  • 收稿日期:2016-02-26 修回日期:2016-08-14 出版日期:2017-03-01 发布日期:2017-03-01
  • 通讯作者: Renjie JIANG, E-mail:jiangrenjie@nbu.edu.cn E-mail:jiangrenjie@nbu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (No. 11402129) and the Zhejiang Provincial Natural Science Foundation of China (No. LY17A020002)

Resonance in flow past oscillating cylinder under subcritical conditions

Renjie JIANG1, Pengjun ZHENG1,2,3   

  1. 1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, Zhejiang Province, China;
    2. National Traffic Management Engineering and Technology Research Centre, Ningbo University Sub-centre, Ningbo 315211, Zhejiang Province, China;
    3. Jiangsu Province Collaborative Innovation Center for Modern Urban Traffic Technologies, Nanjing 210096, China
  • Received:2016-02-26 Revised:2016-08-14 Online:2017-03-01 Published:2017-03-01
  • Contact: Renjie JIANG E-mail:jiangrenjie@nbu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 11402129) and the Zhejiang Provincial Natural Science Foundation of China (No. LY17A020002)

摘要:

Flow around an oscillating cylinder in a subcritical region are numerically studied with a lattice Boltzmann method (LBM). The effects of the Reynolds number, oscillation amplitude and frequency on the vortex wake modes and hydrodynamics forces on the cylinder surface are systematically investigated. Special attention is paid to the phenomenon of resonance induced by the cylinder oscillation. The results demonstrate that vortex shedding can be excited extensively under subcritical conditions, and the response region of vibration frequency broadens with increasing Reynolds number and oscillation amplitude. Two distinct types of vortex shedding regimes are observed. The first type of vortex shedding regime (VSR I) is excited at low frequencies close to the intrinsic frequency of flow, and the second type of vortex shedding regime (VSR II) occurs at high frequencies with the Reynolds number close to the critical value. In the VSR I, a pair of alternately rotating vortices are shed in the wake per oscillation cycle, and lock-in/synchronization occurs, while in the VSR II, two alternately rotating vortices are shed for several oscillation cycles, and the vortex shedding frequency is close to that of a stationary cylinder under the critical condition. The excitation mechanisms of the two types of vortex shedding modes are analyzed separately.

关键词: multi-variable finite element model, singular Unite element, J-integral, lattice Boltzmann method (LBM), subcritical region, resonance phenomenon, oscillating cylinder

Abstract:

Flow around an oscillating cylinder in a subcritical region are numerically studied with a lattice Boltzmann method (LBM). The effects of the Reynolds number, oscillation amplitude and frequency on the vortex wake modes and hydrodynamics forces on the cylinder surface are systematically investigated. Special attention is paid to the phenomenon of resonance induced by the cylinder oscillation. The results demonstrate that vortex shedding can be excited extensively under subcritical conditions, and the response region of vibration frequency broadens with increasing Reynolds number and oscillation amplitude. Two distinct types of vortex shedding regimes are observed. The first type of vortex shedding regime (VSR I) is excited at low frequencies close to the intrinsic frequency of flow, and the second type of vortex shedding regime (VSR II) occurs at high frequencies with the Reynolds number close to the critical value. In the VSR I, a pair of alternately rotating vortices are shed in the wake per oscillation cycle, and lock-in/synchronization occurs, while in the VSR II, two alternately rotating vortices are shed for several oscillation cycles, and the vortex shedding frequency is close to that of a stationary cylinder under the critical condition. The excitation mechanisms of the two types of vortex shedding modes are analyzed separately.

Key words: multi-variable finite element model, singular Unite element, J-integral, lattice Boltzmann method (LBM), oscillating cylinder, resonance phenomenon, subcritical region

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