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Title: Side-surface openings effects on galloping instability for a rectangular cylinder
Authors: Wang, Jiaqi
Yagi, Tomomi  kyouindb  KAKEN_id  orcid (unconfirmed)
Ushioda, Jun
Ichikawa, Hidekazu
Yamamoto, Soichiro
Noguchi, Kyohei  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 八木, 知己
潮田, 潤
市川, 英和
山本, 宗一郎
野口, 恭平
Keywords: Rectangular cylinder
Strouhal number
Time-averaged streamline
Particle-image velocimetry
Issue Date: Nov-2020
Publisher: Elsevier B.V.
Journal title: Journal of Wind Engineering and Industrial Aerodynamics
Volume: 206
Thesis number: 104303
Abstract: Discretely distributed side-surface openings have a stabilizing effect on box girders against galloping. This research intends to further investigate the relationship between the size of the openings and galloping instability with respect to aerodynamic response and aerodynamic damping. An additional objective is to explain the stabilization mechanism against galloping owing to the openings. A series of wind tunnel tests was carried out on rectangular cylinders with different-sized openings that were non-dimensionalized as the Opening-area Ratio (OR), which is the ratio of the total-openings area to half of the front-surface area. At high wind velocities, increasing the OR from 0 to 0.75 increased the aerodynamic damping, and the separated shear layer gradually approached the model’s trailing edge. Increasing it above 0.75 resulted in a decrease of the aerodynamic damping and the separated shear layer reattaching to the model. As OR increased, the galloping onset increased accompanied by the decrease in Strouhal number. Thus, the rectangular cylinder showed good galloping stability owing to the openings, which promoted the reattachment of the separated shear layer on the side surfaces, effectively increasing the body width-to-depth ratio. This research contributes to an innovative method to stabilize rectangular cylinder-like bluff bodies against galloping instability.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
The full-text file will be madeopen to the public on 1 November 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.jweia.2020.104303
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