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Lattice-Boltzmann simulation of two-dimensional flow over two vibrating side-by-side circular cylinders
Yousheng Xu1, Yang Liu, Yong Xia
1Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 312004, China. ysyou@zjnu.cn
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2008
Summary
Fluid flow over vibrating cylinders was simulated. Cylinder vibration significantly alters wake patterns, with large amplitudes locking vortex shedding and formation, dependent on frequency and amplitude thresholds.
Area of Science:
- Fluid Dynamics
- Computational Physics
Background:
- Understanding fluid flow around bluff bodies is crucial in various engineering applications.
- The behavior of wake patterns behind cylinders is complex and influenced by external factors.
Purpose of the Study:
- To investigate fluid flow over two side-by-side vibrating circular cylinders.
- To analyze the effect of cylinder vibration on wake characteristics using numerical simulations.
Main Methods:
- Multiple Relaxation Time Lattice-Boltzmann Method (MRT-LBM) was employed for numerical simulation.
- Simulations were conducted at a Reynolds number of 200 for pitch ratios of 1.2, 1.6, 2.2, and 3.2.
Main Results:
- Cylinder vibration was found to significantly influence wake patterns.
- Sufficient vibration amplitude can lead to the lock-up of vortex shedding and formation.
- A threshold vibration amplitude for lock-up exists for each frequency, decreasing as frequency increases.
Conclusions:
- Cylinder vibration is a key factor in controlling wake dynamics.
- The lock-up phenomenon demonstrates a clear relationship between vibration amplitude, frequency, and vortex shedding behavior.
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