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Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field
https://orcid.org/https://orcid.org/0000-0003-4522-2531
https://orcid.org/https://orcid.org/0000-0002-2218-7879
https://orcid.org/https://orcid.org/0000-0002-2659-4308
This study investigates the aerodynamic admittances of a closed-box girder in both streamwise (u-) and vertical (w-) sinusoidal flow fields. A series of sinusoidal flows with discrete oscillation frequencies (fu = 00.2–1.2 Hz) and different oscillation amplitudes (Δu = 0.5 – 2.0 m/s) are experimentally generated, which are fully coherent in the span-wise direction. Meanwhile, the Computational Fluid Dynamics (CFD) method is utilized to simulate streamwise sinusoidal flows with higher frequencies (fu = 0.2–14 Hz). The u-turbulence-related two-dimensional aerodynamic admittance functions (2D AAFs) of the closed-box girder are identified frequency by frequency. On the other hand, the vertical sinusoidal flows are numerically simulated (fw = 0.2–14 Hz, Δw = 1.2 m/s), and the w-turbulence-related 2D AAFs are identified. Finally, the differences between u-, w- admittances and the equivalent ones are compared. The results indicate that u- and w-turbulence-related AAFs have different trends with the reduced frequency, and thus it is inaccurate to treat the contributions of u- and w-turbulence to admittances as equivalent in previous studies.
Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field
https://orcid.org/https://orcid.org/0000-0003-4522-2531
https://orcid.org/https://orcid.org/0000-0002-2218-7879
https://orcid.org/https://orcid.org/0000-0002-2659-4308
This study investigates the aerodynamic admittances of a closed-box girder in both streamwise (u-) and vertical (w-) sinusoidal flow fields. A series of sinusoidal flows with discrete oscillation frequencies (fu = 00.2–1.2 Hz) and different oscillation amplitudes (Δu = 0.5 – 2.0 m/s) are experimentally generated, which are fully coherent in the span-wise direction. Meanwhile, the Computational Fluid Dynamics (CFD) method is utilized to simulate streamwise sinusoidal flows with higher frequencies (fu = 0.2–14 Hz). The u-turbulence-related two-dimensional aerodynamic admittance functions (2D AAFs) of the closed-box girder are identified frequency by frequency. On the other hand, the vertical sinusoidal flows are numerically simulated (fw = 0.2–14 Hz, Δw = 1.2 m/s), and the w-turbulence-related 2D AAFs are identified. Finally, the differences between u-, w- admittances and the equivalent ones are compared. The results indicate that u- and w-turbulence-related AAFs have different trends with the reduced frequency, and thus it is inaccurate to treat the contributions of u- and w-turbulence to admittances as equivalent in previous studies.
Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field
https://orcid.org/https://orcid.org/0000-0003-4522-2531
https://orcid.org/https://orcid.org/0000-0002-2218-7879
https://orcid.org/https://orcid.org/0000-0002-2659-4308
This study investigates the aerodynamic admittances of a closed-box girder in both streamwise (u-) and vertical (w-) sinusoidal flow fields. A series of sinusoidal flows with discrete oscillation frequencies (fu = 00.2–1.2 Hz) and different oscillation amplitudes (Δu = 0.5 – 2.0 m/s) are experimentally generated, which are fully coherent in the span-wise direction. Meanwhile, the Computational Fluid Dynamics (CFD) method is utilized to simulate streamwise sinusoidal flows with higher frequencies (fu = 0.2–14 Hz). The u-turbulence-related two-dimensional aerodynamic admittance functions (2D AAFs) of the closed-box girder are identified frequency by frequency. On the other hand, the vertical sinusoidal flows are numerically simulated (fw = 0.2–14 Hz, Δw = 1.2 m/s), and the w-turbulence-related 2D AAFs are identified. Finally, the differences between u-, w- admittances and the equivalent ones are compared. The results indicate that u- and w-turbulence-related AAFs have different trends with the reduced frequency, and thus it is inaccurate to treat the contributions of u- and w-turbulence to admittances as equivalent in previous studies.
Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field
KSCE J Civ Eng
Li, Haohong (author) / Zhang, Liangliang (author) / Wu, Bo (author) / Yang, Yang (author) / Xiao, Zhao (author)
KSCE Journal of Civil Engineering ; 26 ; 1267-1281
2022-03-01
15 pages
Article (Journal)
Electronic Resource
English
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