A study of the effect of the jet-like flow on the near wake behind a circular cylinder close to a plane wall

Khabbouchi, Imed; Guellouz, Mohamed Sadok; Nasrallah, Sassi Ben

doi:10.1016/j.expthermflusci.2012.05.019

Cited by 18 publications

(5 citation statements)

References 26 publications

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“…Numerical simulations first were validated using experimental studies conducted on flow around a single stationary cylinder under the effect of a rigid wall [23,24]. Following the validation, the results of numerical analyses for both case studies (Case Studies I and II) are presented in this section.…”

Section: Resultsmentioning

confidence: 99%

“…For the ease of comparison, the Reynolds numbers were chosen similar to the ones used in the experiments of Price, Sumner [23] and Khabbouchi, Guellouz [24] (Re = 1,400, 3,900 and 8,700). Typical results of dimensionless mean velocity ( U V W ) at G/D = 1.0 are compared with experimental data of Khabbouchi, Guellouz [24] at six sections behind the cylinder (Figure 4). Here, U X is the average of the x-velocity, which was calculated over the total running time.…”

Section: A Validation Of the Modelmentioning

confidence: 99%

“…Comparison of the mean streamwise ( U X W ) profiles in the near wake of the cylinder at gap ratio G/D = 1.0 and Re = 8,700 for a single cylinder. The experimental results extracted from Khabbouchi et al[24] and are shown as red squares. The simulations are the blue circles.…”

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confidence: 99%

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Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders

Derakhshandeh

Arjomandi

Cazzolato

et al. 2014

Journal of Renewable and Sustainable Energy

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Vortex Induced Vibrations (VIV) plays a key role in a wide range of engineering applications including the extraction of renewable energy. In this paper, numerical studies of the phenomenon of VIV were conducted to investigate the flow behaviour around two identical circular cylinders. The upstream cylinder was located in the vicinity of a rigid wall and downstream one was mounted on an elastic support with one degree of freedom (1-DOF). The Reynolds number based on the cylinder's diameter was kept constant at 8,700, while the separation between the upstream cylinder and the wall was varied. The results show that this separation distance known as the gap ratio has a significant effect on the dynamic behaviour of the upstream and downstream cylinders. Accordingly, the interaction of shear layers between the upstream cylinder and the rigid wall has a strong influence on the vortex dynamics of both cylinders, in particular when the upstream cylinder was mounted close to the wall. In this arrangement, a jet flow produced in the wake of the upstream cylinder significantly affects the vortex shedding frequency, and the lift and drag coefficients of both cylinders. This can alter the dynamic response of the downstream cylinder and theoretical efficiency of the VIV power.

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Section: Resultsmentioning

confidence: 99%

Section: A Validation Of the Modelmentioning

confidence: 99%

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Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders

Derakhshandeh

Arjomandi

Cazzolato

et al. 2014

Journal of Renewable and Sustainable Energy

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“…The resulting pressure pulsations in the liquid can affect the operation of the nozzle with small overshoots, the separation of the boundary layer from the walls of the nozzle or its blocking is possible. Pressure pulsations propagating in an external hydroacoustic field can be used to recognize and identify underwater objects [5,6]. Modern methods of computational fluid dynamics make it possible to resolve these processes at a high level of detail and reliability [7].…”

Section: Introductionmentioning

confidence: 99%

Outflow of a supersonic gas jet into a liquid

Yakovchuk

Волков

Emel’yanov

2022

J. Phys.: Conf. Ser.

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Numerical modeling of the underwater outflow of a supersonic gas jet in a three-dimensional non-stationary formulation is carried out using an eddy-resolving approach based on a combination of RANS-LES turbulence modeling methods. The calculation of the interaction of a gaseous medium with a liquid is carried out using the VOF multi-phase model, the forces of surface tension and the compressibility of the liquid are taken into account. As a result of calculations, an unsteady pattern of the formation of a supersonic jet and a gas cavity in a liquid is obtained, the shock-wave structure of the flow is visualized, and pressure fluctuations in the liquid are estimated. The results of calculations are compared with the data of experimental high-speed photography.

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“…Studies of the flow around a cylinder near the wall include data on the effect of the gap between the cylinder and the wall on the frequency of vortex formation (von Karman road), as well as information on the interaction of shear layers on the surface of the cylinder and on the wall depending on the gap and the Reynolds number [5,[24][25][26]. A system of large-scale horseshoe-shaped vortices is formed at the junction of the shedder body and the walls parallel to the flow.…”

Section: Introductionmentioning

confidence: 99%

Coupled Simulation of Fluid Flow and Vibro-Acoustic Processes in the Channel with a Circular Cylinder

Волков

2022

Fluids

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Vibro-acoustic processes are an interacting set of pulsations of the working fluid and vibrations of mechanical structural elements. The simulation of vibro-acoustic processes in a long pipe with an elastic round cylinder is considered. The mathematical model is developed in a coupled formulation, when not only pressure pulsations cause pipe vibrations, but also vibrations of the mechanical subsystem affect sound wave propagation in the working fluid. The influence of vortex formation processes in the channel on the system dynamics is taken into account. The fluid flow is found using delayed detached eddy simulation. The flow regimes around a single round cylinder corresponding to various Reynolds numbers are investigated to validate the computational algorithm. The distributions of the flow quantities and vibro-acoustic behavior of the system are discussed.

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A study of the effect of the jet-like flow on the near wake behind a circular cylinder close to a plane wall

Cited by 18 publications

References 26 publications

Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders

Effect of a rigid wall on the vortex induced vibration of two staggered circular cylinders

Outflow of a supersonic gas jet into a liquid

Coupled Simulation of Fluid Flow and Vibro-Acoustic Processes in the Channel with a Circular Cylinder

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