Unsteady aerodynamics on a tapered prism under forced excitation

Chen, Zengshun; Huang, Hailin; Xu, Yemeng; Tse, K.T.; Kim, Bubryur; Wang, Yatai

doi:10.1016/j.engstruct.2021.112387

Cited by 20 publications

(9 citation statements)

References 34 publications

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“…Given the relatively insignificant nature of along-wind aeroelastic effects (Chen et al, 2021b;Fu et al, 2022) and the generally positive values of along-wind aerodynamic damping ratios, which are favorable for structural wind-resistant design, this section mainly discusses local across-wind aeroelastic parameter coefficients under across-wind vibration.…”

Section: Local Aeroelastic Parameter Coefficientsmentioning

confidence: 99%

“…Furthermore, backward-inclined prisms are more prone to negative aerodynamic damping than forward-inclined prisms. Furthermore, Chen et al(2021aChen et al( , 2021b investigated unsteady aerodynamics on a tapered prism and discovered a novel phenomenon termed "partial reattachment" in the separated shear layer, resulting in a discontinuous vortex shedding process. Song et al(2019) introduced an innovative bidirectional forced vibration apparatus and performed wind tunnel tests based on an engineering project.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Fu,

Quan,

Feng

et al. 2024

Preprint

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Unsteady aerodynamic forces play a crucial role in phenomena such as vortex-induced vibration and galloping. However, the influence of turbulence on unsteady aerodynamics remains far from been fully understood. In this study, a series of forced vibration model and rigid model wind tunnel tests were conducted in both a uniform flow and three different turbulent boundary layer flows with varying turbulence conditions to investigate the unsteady aerodynamic forces of a slender three-dimensional prism. Turbulence effects on the along-wind and across-wind unsteady wind pressure, local and generalized aerodynamic force coefficients, Strouhal number, correlations and coherence functions of unsteady aerodynamic forces, and aeroelastic parameters were comparatively investigated, and the underlying mechanisms were further discussed. The results show remarkable differences in unsteady aerodynamics between the uniform and turbulent flows due to the complex coupling effects among the turbulence, vibration amplitude, and reduced wind speed. The vibration has a significant impact on the unsteady aerodynamics in the same direction. Additionally, along-wind vibration could influence across-wind unsteady aerodynamic forces, while across-wind vibration has minimal effects on along-wind aerodynamic forces. Increasing the amplitude of across-wind vibration significantly increases vertical correlation coefficients within the lock-in region but notably reduces the separation length, weakening horizontal correlation coefficients on the sideward face. Nonetheless, the unsteady aerodynamics are mainly determined by the quasi-steady states beyond the lock-in region, and the influence of vibration is generally negligible. As turbulence intensity increases, the power spectra densities of across-wind aerodynamic forces become wider, and the across-wind aerodynamic force coefficients and aeroelastic parameters exhibit more moderate variations with reduced wind speeds. Both the vertical and horizontal correlation coefficients decrease noticeably at a high level of turbulence intensity, and the end effect and the formation of nonlinear aerodynamics are also suppressed. The Strouhal number of the three-dimensional oscillating prism is little affected by turbulence. However, the lock-in region is extended in turbulent flows compared to uniform flow.

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Section: Local Aeroelastic Parameter Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Fu,

Quan,

Feng

et al. 2024

Preprint

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“…The aerodynamic properties and flow surrounding these inclined building structures are particularly responsive to changes in cross-sectional geometry and boundary conditions. Consequently, researching wind resistance performance has become of paramount importance [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The findings demonstrate that the responses predicted by the aerodynamic forces on the aeroelastic model are in close concurrence with the experimental outcomes, whereas significant inconsistencies are detected in both the forced vibration and rigid models. Chen et al [1] analyzed the wind pressure distributions and unsteady force coefficients on the tapered model. The results demonstrated that the root mean square lift coefficient increases significantly with amplitudes of oscillation at low wind speeds, while at high wind speeds, the influence of structural oscillation is significantly reduced and the aerodynamic force is in a quasistatic state.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study of the aerodynamic characteristics of an aspect ratio of 6.25:1 inclined square prism

et al. 2023

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Inclined prismatic structures have grown in popularity in civil engineering due to increased architectural and aesthetic demands, leading to a surging need to study their aerodynamic properties. In this study, an inclined square prism was examined using wind tunnel tests and numerical simulations with an aspect ratio of 6.25:1. The Synchronous Multi-Pressure Sensing System (SMPSS) wind tunnel technique was used to evaluate the aerodynamic characteristics of the structure, including surface pressure distribution, local force spectra, force coefficient, coherence, and the Strouhal number. Moreover, the numerical Large-eddies simulation (LES) were also deployed to investigate the flow field morphology around the structure. Results show that the orientation, direction, and angle of inclination direction significantly affect the prism’s aerodynamic characteristics. Several flow field phenomena were also revealed. Forward inclination enhances the downwash flow, whereas the backward counterpart enhances the upwash flow, and transverse inclination produces a noticeable modification in the vortex morphology near the prism base. These findings can inform structural design and contaminant dispersion efforts.

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“…Several tall buildings are densely concentrated in modern cities, and they are near each other. The wind-induced response and aerodynamics, such as wind velocities and vectors around the buildings, wind pressures on surfaces, and wind loads, vary significantly among tall standalone structures [1][2][3][4][5][6][7]. Therefore, researchers have studied the wind velocities and vectors around numerous buildings using flow visualization or particle image velocimetry (PIV) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics and Lateral Displacements of a Set of Two Buildings in a Linked Tall Building System

Chen

Kim

Lee

2021

Sensors

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This study evaluates the aerodynamic characteristics and lateral displacements of two staggered buildings in a linked-building (LB) system. Particle image velocimetry and pressure measurements are employed, and the lateral displacement is evaluated using a 3-dimensional analytical model. When the gap distance between two non-linked buildings is small, the wind flows in a narrow jet, and a strong suction is generated on the inner surfaces of the two buildings, leading to a large cross-wind-induced response. However, the cross-wind-induced response is significantly reduced when a link is installed, because the suction forces generated from the buildings are in opposite directions and have a negative aerodynamic correlation. Conversely, with a large gap distance, the buildings at the front obstruct the wind blowing toward the rear buildings. Therefore, while the pressure distribution, wind-force coefficients, and wind-induced responses of the front and rear buildings show similar trends, the magnitude of impact on the front building is larger than that on the rear building. Installing a link is demonstrated to reduce the wind-induced response of the buildings in an LB system. However, the reduction in the along-wind-induced response is less than that in the cross-wind-induced response when the gap distance is small.

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Unsteady aerodynamics on a tapered prism under forced excitation

Cited by 20 publications

References 34 publications

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

A comprehensive study of the aerodynamic characteristics of an aspect ratio of 6.25:1 inclined square prism

Aerodynamic Characteristics and Lateral Displacements of a Set of Two Buildings in a Linked Tall Building System

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