MICROSCOPIC MECHANISM INVESTIGATION OF FREQUENCY LOCKING IN UNIDIRECTIONAL VIV OF CIRCULAR CYLINDER

Tian Rui; Lyu Duo; Wang Zhangqi; Cao Yunhao

doi:10.19912/j.0254-0096.tynxb.2024-2439

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 429-437. DOI: 10.19912/j.0254-0096.tynxb.2024-2439

MICROSCOPIC MECHANISM INVESTIGATION OF FREQUENCY LOCKING IN UNIDIRECTIONAL VIV OF CIRCULAR CYLINDER

Tian Rui, Lyu Duo, Wang Zhangqi, Cao Yunhao

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Abstract

To investigate the mechanism of frequency locking in unidirectional vortex-induced vibrations of a circular cylinder, a fluid-structure interaction simulation was performed using a numerical approach incorporating UDF and dynamic mesh techniques. A comparative analysis was carried out on the boundary layer separation processes and the vortex trajectories, from formation to detachment, under two conditions： disturbed flow and unidirectional vortex-induced vibration. Results indicate that in unidirectional vortex-induced vibrations, the cylinder's motion influences boundary layer separation, significantly reducing vortex shedding frequency, particularly during resonance, leading to frequency locking. In the locked state, the vigorous motion of the cylinder forces the vortices away from its surface, causing the separated boundary-layer vortices to disappear due to the loss of compressive confinement. As the recirculation zone approaches the cylinder, new vortices regenerate. During vortex-induced vibrations, an additional reattachment vortex forms on the cylinder surface following boundary layer separation. Under the influence of the mainstream flow, the reattachment vortex merges with the separated boundary-layer vortex, generating a stronger vortex.

Key words

circular cylinders / vortex shedding / computational fluid dynamics / vortex induced vibration / frequency locking / boundary layer separation

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Tian Rui, Lyu Duo, Wang Zhangqi, Cao Yunhao. MICROSCOPIC MECHANISM INVESTIGATION OF FREQUENCY LOCKING IN UNIDIRECTIONAL VIV OF CIRCULAR CYLINDER[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 429-437 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2439

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