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Establishment of vortex-induced force model and evaluation of vortex-induced vibration amplitude of 5:1 rectangular cylinders in turbulent flow fields
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DOI：10.1016/j.jweia.2026.106547.png)
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Abstract
En 中文
The vortex-induced vibration (VIV) performance of engineering structures is typically evaluated in uniform flow fields. However, the actual service environment of structures is an atmospheric turbulent flow field, in which the influence of turbulence on their VIV performance exhibits significant uncertainty. Relying solely on the current evaluation methods may lead to misjudgments of the structural VIV performance. Based on the Scanlan nonlinear vortex-induced force (VIF) model in uniform flow fields and the derivation of the VIF in turbulent flow fields, this study introduces the concept of the mean VIF parameter. A VIF model applicable to bluff body sections in turbulent flow fields is established, and a prediction method for VIV amplitude is proposed. Subsequently, the classic 5:1 rectangular cylinder is selected as the research object, and the VIV response in different turbulent flow fields are measured using segmental model vibration tests. The influence mechanism of turbulence on VIV amplitude is analyzed. Based on the test results, the VIF parameters of the structure in turbulent flow fields are identified, and a correction is then performed by considering the incomplete correlation of the VIF along the spanwise direction. Finally, the improved three-dimensional VIV analysis method is employed to predict the VIV amplitude in a given turbulent flow field. The results are compared with those calculated by existing methods and the segmental model tests, verifying the applicability of the proposed VIV amplitude prediction method for bluff body structures in turbulent flow fields. This study lays a theoretical foundation for the VIV analysis of practical bluff bodies.
Keywords:
Vortex-induced vibration
Bluff body
5:1 rectangular cylinder
Turbulent flow field
Vortex-induced force
Vortex-induced vibration amplitude
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