3D vortex structure investigation using Large Eddy Simulation of flow around a rotary oscillating circular cylinder

Aguedal, Liyes; Semmar, Djaffar; Berrouk, Abdallah S.; Aberqi, Ahmed; Oualli, H.

doi:10.1016/j.euromechflu.2018.04.001

Cited by 28 publications

(12 citation statements)

References 41 publications

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“…7. At x/D=0.58, the streamwise velocity profile calculated from the present simulation is in good agreement with the previous experimental data ofParnaudeau et al[42] and Lourenco and Shih[41] as well as numerical results of Meyer[27] and Liyes[40]. At downstream positions of x/D=1.06, 1.54 and 2.02, all experimental and numerical results indicate that both the maximum deficit velocity and velocity gradient reduce with the wake development, but the detailed recovery of the deficit velocity has some deviations among all the data.…”

supporting

confidence: 91%

“…where p∞ and ρ∞ are the reference pressure and density, respectively, which are chosen as the incoming flow values. The present numerical result is in good agreement with the experimental data of Norberg [25] and has slight deviations from the numerical results obtained by Mittal [39] and Breuer [26] and Liyes [40]. [42] as well as numerical results of Meyer [27], Kahll [43] and Liyes [40].…”

supporting

confidence: 89%

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Control of cylinder wake flow and noise through a downstream porous treatment

Mao

2019

Aerospace Science and Technology

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Various passive and active methods have been developed to control flow separation from bluff bodies. However, these methods require adjusting features of the solid surface, such as modifying its geometry or porosity, or applying external force or momentum. This paper develops an off-body-based method, without adjusting any features of the solid surface, for controlling the unsteady flow separation by fixing porous materials downstream of bluff bodies. Numerical study on flow past a circular cylinder at a subcritical Reynolds number is performed, and the result indicates that the added downstream porous material changes flow in the wake and re-laminarizes the turbulent flow around the curved cylinder surface, reducing the wall pressure fluctuation around the cylinder. therefore, the associated aerodynamic noise is reduced greatly.

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supporting

confidence: 91%

supporting

confidence: 89%

Control of cylinder wake flow and noise through a downstream porous treatment

Mao

2019

Aerospace Science and Technology

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“…According to Figure 10, it is apparent that the velocity curve shows a "U" shape near the cylinder, while the curve changes and presents a "V" shape away from the cylinder. These phenomena can also be found in the research of Aguedal et al [35]. The averaged streamwise velocity (U/V ∞ ) profiles in the near wake behind the cylinder are reported in Figure 10.…”

Section: Velocity Fieldsupporting

confidence: 77%

Study of the Drag Reduction Characteristics of Circular Cylinder with Dimpled Surface

Yan

Yang

Wang

2021

Water

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To reduce the drag of a cylinder, numerical simulations and experiments for both smooth cylinder and circular cylinder with the dimpled surface are carried out in this paper. The numerical simulation focuses on the variation of pressure coefficient, skin friction coefficient, and vortex shedding strength of the smooth cylinder and the circular cylinder with the dimpled surface. It is found that the dimpled structure can effectively reduce the drag of the cylinder within a specific range of Reynolds number, and the maximum drag reduction rate reaches up to 19%. Another conclusion is that the pressure drag and skin friction drag have an essential influence on the total drag of the circular cylinder with the dimpled surface. On the other hand, the strength of vortex shedding also decreases with the decrease of cylinder drag. Then, the flow field of both cylinders is measured using the particle image velocimetry (PIV) technique, confirming that the dimpled structure can affect the velocity field, the release of vortices and the scale of the vortex. More specifically, the velocity recovery of the circular cylinder with the dimpled surface is faster than that of the smooth cylinder, and the dimpled structure delays the release of the vortex at a specific range of Reynolds number.

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“…To verify the conclusion drawn from the simulation data, the time-average velocity under Re = 6.8 × 10 3 and Re = 3 × 10 4 are extracted from the experimental flow field, as shown in Figure 15a,b. It can be found from Figure 15a,b that the curve shows a "U" shape near the cylinder, while the curve changes and presents a "V" shape away from the cylinder [26], something which is also reflected in the simulation data. However, the values of velocity in experiments are generally lower than those in simulation, which may be due to the mixing of tracer particles and other impurities in the fluid in experiments.…”

Section: Velocity Fieldmentioning

confidence: 62%

A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface

Chen

et al. 2021

Water

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In this study, the drag reduction effect is studied for a cylinder with different V-groove depths on its surface using a k-ω/SST (Shear Stress Transport) turbulence model of computational fluid dynamics (CFD), while a particle image velocimetry (PIV) system is employed to analyze the wake characteristics for a smooth cylinder and a cylinder with different V-groove depths on its surface at different Reynolds numbers. The study focuses on the characteristics of the different V-groove depths on lift coefficient, drag coefficient, the velocity distribution of flow field, pressure coefficient, vortex shedding, and vortex structure. In comparison with a smooth cylinder, the lift coefficient and drag coefficient can be reduced for a cylinder with different V-groove depths on its surface, and the maximum reduction rates of lift coefficient and drag coefficient are about 34.4% and 16%, respectively. Otherwise, the vortex structure presents a complete symmetry for the smooth cylinder, however, the symmetry of the vortex structure becomes insignificant for the V-shaped groove structure with different depths. This is also an important reason for the drag reduction effect of a cylinder with a V-groove surface.

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3D vortex structure investigation using Large Eddy Simulation of flow around a rotary oscillating circular cylinder

Cited by 28 publications

References 41 publications

Control of cylinder wake flow and noise through a downstream porous treatment

Control of cylinder wake flow and noise through a downstream porous treatment

Study of the Drag Reduction Characteristics of Circular Cylinder with Dimpled Surface

A Study of Drag Reduction on Cylinders with Different V-Groove Depths on the Surface

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