Aerodynamic Interference Study of Vortex-Induced Vibration of Twin-Separate Rectangular Sections Based on POD

Abstract:

To study aerodynamic interference of twin-deck sections under vortex-induced vibration (VIV), a series of wind tunnel tests are implemented. Horizontal interval ratio (D/B) is taken into consideration a factor influencing VIV behavior, and the results are compared with single section. Surface pressure distribution of the twin sections are acquired by synchronous pressure measurements when the sections are under vertical and torsional VIV. Proper orthogonal decomposition (POD) is employed to reconstruct the randomly fluctuating wind pressure field. It identifies the vertical and torsional vibration frequency of model and energy proportion of eigenmodes. VIV behavior of twin-deck sections is different from single section, and it changes with different D/B. In general, the position, where D/B=1, is unfavorable to VIV behavior of twin-deck sections. The aerodynamic interference does not always amplify or restrain the amplitude of VIV. Several lower modes can reconstruct fluctuating pressure field to the accuracy meeting the requirement of engineering.

• Periodical: Applied Mechanics and Materials (Volumes 638-640)
• Pages: 916-924
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.638-640.916
• Online since: September 2014
• Authors: Kai Ma*, Zhi Zhong Zhou
• Keywords: Aerodynamic Interference, POD, Synchronous Pressure Measurements, Twin-Separate Sections, VIV, Wind Tunnel Test

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