Aerodynamic interferences in vortex-induced vibration of dual-rectangular sections based on wind tunnel tests and numerical simulation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (1) : 157-183.

MA Kai, HU Chuanxin, YUAN Wancheng, ZHOU Zhiyong, DANG Xinzhi

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Abstract

Here, segment model’s wind tunnel tests and CFD simulation were conducted to investigate aerodynamic interferences in vortex-induced vibration (VIV) of dual-rectangular sections with the aspect ratio of 5. Effects of horizontal spacing on dual-rectangular sections’ vertical bending and torsional VIV responses were analyzed. Dynamic pressure measurements were done during the horizontal spacing ratio being 1.2. POD analysis was conducted for fluctuating wind pressure field under vertical bending and torsional VIV wind velocities, respectively. The results showed that there are significant aerodynamic interferences between dual-rectangular sections, and VIV response of downstream section is larger than that of upstream one in general; the first two POD modes are correlated with VIVs of dual-rectangular sections, and the first two POD modes can be used to reconstruct fluctuating wind pressure fields. CFD simulation results showed that VIV of dual-rectangular sections conforms to "instability mechanism of impact shear layer", and flowing variations are more significant in areas of downwind direction of upstream section and upwind direction of downstream section within one period; CFD simulation results are consistent to those of POD analysis, the former combined with the latter can be used to analyze VIV phenomena of dual-rectangular sections.

Key words

wind tunnel test / dual-rectangular section / vortex-induced vibration (VIV) / aerodynamic interference / proper orthogonal decomposition (POD) / computational fluid dynamics (CFD)

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MA Kai, HU Chuanxin, YUAN Wancheng, ZHOU Zhiyong, DANG Xinzhi. Aerodynamic interferences in vortex-induced vibration of dual-rectangular sections based on wind tunnel tests and numerical simulation[J]. Journal of Vibration and Shock, 2020, 39(1): 157-183

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