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Resonance in flow past oscillating cylinder under subcritical conditions
- Source :
- Applied Mathematics and Mechanics. 38:363-378
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
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.
- Subjects :
- Physics
Oscillation
Applied Mathematics
Mechanical Engineering
Lattice Boltzmann methods
Reynolds number
Mechanics
Wake
Critical value
Vortex shedding
01 natural sciences
010305 fluids & plasmas
Vortex
Physics::Fluid Dynamics
symbols.namesake
Classical mechanics
Mechanics of Materials
0103 physical sciences
symbols
Cylinder
010306 general physics
Subjects
Details
- ISSN :
- 15732754 and 02534827
- Volume :
- 38
- Database :
- OpenAIRE
- Journal :
- Applied Mathematics and Mechanics
- Accession number :
- edsair.doi...........aa217c9f83563cb796744003a878ff30