Experimental determination of the two-dimensional aerodynamic admittances of a 5:1 rectangular cylinder in streamwise sinusoidal flows

Wu, Bo; Li, Shaopeng; Zhang, Liangliang; Li, Ké

doi:10.1016/j.jweia.2021.104525

Cited by 18 publications

(9 citation statements)

References 44 publications

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“…Li et al 203 analysed aerodynamic pressures of a 5:1 rectangular cylinder under pulsating inflows and indicated that the maximum RMS pressure coefficient and the Strouhal number increase with gust amplitude while the separation bubble length considerably reduces. In another study, Wu et al 204 measured aerodynamic forces of a 5:1 rectangular cylinder under streamwise sinusoidal flows, and also separated inflow-induced and vortex-induced components of the total forces. Aforementioned studies on the pulsating inflow are tabulated in Table 3.…”

Section: Pulsating Inflowmentioning

confidence: 99%

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A review of experiments on stationary bluff body wakes

Feshalami

Scarano

et al. 2022

Physics of Fluids

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Experimental studies dealing with the wake of isolated stationary bluff-bodies are reviewed. After briefly recalling the pioneering works in this domain, the paper focuses on recent research conducted with the latest experimental methods and techniques. The review encompasses a range of topics, including, the effects of bluff-body geometry (non-circular cross sections and nonuniformity in spanwise direction), steady and unsteady (periodic and non-periodic) inflow conditions; surface proximity (rigid wall, confinement and water free surface) and non-Newtonian fluids. Focus is brought to the flow physics of the wakes, including especially the complex threedimensional and oscillatory behaviours induced by the periodic vortex shedding phenomenon. The paper aims to offer a critical and systematic review of new knowledge and findings on the subject area, as well as emerging? and the most frequently adopted experimental techniques. The review also helps identifying knowledge gaps in the literature that need to be addressed in future investigations.

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Section: Pulsating Inflowmentioning

confidence: 99%

“…Aforementioned studies on the pulsating inflow are tabulated in Table 3. 204 Rectangular cylinder (L1.3m×W0.15m×H0.03m) -16,080 0.2-1.2 Hz 0-0.25 Open-circuit wind tunnel (L10m×W1.5m×H1.8m) • Pressure scanners 1 Root-mean-square perturbation amplitude of the velocity (A/√2) 2 Root-mean-square of gust amplitude…”

Section: Pulsating Inflowmentioning

confidence: 99%

A review of experiments on stationary bluff body wakes

Feshalami

Scarano

et al. 2022

Physics of Fluids

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“…Later, Yang et al (2017) studied the 2D AAFs of a thin airfoil in experimentally generated sinusoidal flow with discrete frequency. Recently, with the help of active generation wind tunnels, an effective method is obtained to generate the downstream flow field (Wu et al, 2021).…”

Section: Article History Abstractmentioning

confidence: 99%

“…In the experimentally generated sinusoidal flow field, the characteristic frequencies of global forces are the same as the inflow frequency f u . This suggests that the aerodynamic forces of the model in the sinusoidal flow field are contributed by the oscillating inflow velocity(Wu et al, 2021).…”

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confidence: 96%

Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field

Zhang

et al. 2021

KSCE J Civ Eng

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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 (f u = 0.2 − 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 (f u = 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 (f w = 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. Aerodynamic admittanceWind tunnel CFD Sinusoidal flows Closed-box girder CORRESPONDENCE Bo Wu

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“…Calculating frequencyby-frequency the power spectral density (PSD) of the aerodynamic forces and the approaching flow, the AAF can be determined through wind tunnel tests in a series of sinusoidal flows. This method was called the "separated frequency-by-frequency method (SFFM)" and was extensively adopted in Chen et al [6], Ma et al [7], Yang et al [8], Wu et al [9], etc., to identify the AAF of a variety of structures.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Forces on a Bluff Cylinder in Sinusoidal Streamwise Winds with Different Angles of Attack

Zhou

Xin

et al. 2022

Buildings

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In the present study, multiple-fan active control wind tunnel tests are conducted to investigate the aerodynamic forces on a 5:1 rectangular cylinder in sinusoidal streamwise winds with different angles of attack (AoA). The effects of the frequency, amplitude, and AoA of the sinusoidal flow on the statistical parameters, spectral characteristics, and spanwise distributions of drag, lift, and moment coefficients are analyzed. Results show that each force has two components: the one induced by the approaching velocity oscillation and the one induced by wake vortex-shedding—this is quite different from that in the smooth flows, where the fluctuating forces are totally due to wake vortex-shedding. For each force, changes of the two components and their relationship with the frequency, amplitude, and AoA are presented. The drag fluctuations are generally dominated by the approaching velocity oscillations, whereas the lift and moment are more sensitive to wake vortex-shedding. Therefore, the drag force has better spanwise correlations than the lift and moment forces. Meanwhile, at a non-zero AoA, the inflow amplitude has different effects on the vortex-shedding-induced component as that at a zero AoA. The differences of spanwise distributions between the sinusoidal flow cases and the smooth flow cases are analyzed.

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Experimental determination of the two-dimensional aerodynamic admittances of a 5:1 rectangular cylinder in streamwise sinusoidal flows

Cited by 18 publications

References 44 publications

A review of experiments on stationary bluff body wakes

A review of experiments on stationary bluff body wakes

Investigation of the 2D Aerodynamic Admittances of a Closed-Box Girder in Sinusoidal Flow Field

Aerodynamic Forces on a Bluff Cylinder in Sinusoidal Streamwise Winds with Different Angles of Attack

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