Aerodynamic pressures on a 5:1 rectangular cylinder in sinusoidal streamwise oscillatory flows with non-zero mean velocities

Li, Ming; Li, Qiusheng; Shi, Haoyun

doi:10.1016/j.jweia.2020.104440

Cited by 19 publications

(3 citation statements)

References 43 publications

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“…On the other hand, changes of fu have limited influences on St either at zero or nonzero AoAs, which is consistent with the results of Li et al [30] for a zero AoA. It was concluded in many works in the literature [36][37][38] that the effects of the integral length scale highly depend on the ratio L/D, where L is the longitudinal integral length scale of the flow and D is the characteristic size of the structure.…”

Section: Spectral Analysissupporting

confidence: 87%

“…Wu et al [29] numerically investigated a BARC cylinder's separated flow and near-wake characteristics in sinusoidal flows. Li et al [30] studied the aerodynamic pressures of a BARC cylinder in sinusoidal flows at a zero AoA, which were generated by vibrating airfoils. Using an active-controlled multiple-fan system, Wu et al [9] measured the aerodynamic forces of a BARC cylinder in sinusoidal flows at a zero AoA; their results showed that both the inflow velocity oscillations and wake vortex-shedding contribute to the fluctuations of the drag, lift, and pitching moment forces.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Spectral Analysissupporting

confidence: 87%

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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“…They also claimed that although the blockage and aspect ratio could affect the near-wake region, qualitative characteristics remain almost unchanged. 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.…”

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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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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Effect of sinusoidal vertical gust on the pressure distributions on and flow structures around a rectangular cylinder

Shi

2021

Exp Fluids

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Aerodynamic pressures on a 5:1 rectangular cylinder in sinusoidal streamwise oscillatory flows with non-zero mean velocities

Cited by 19 publications

References 43 publications

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

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

A review of experiments on stationary bluff body wakes

Effect of sinusoidal vertical gust on the pressure distributions on and flow structures around a rectangular cylinder

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