Simulation of viscous flow around a circular cylinder near a moving ground

Bimbato, Alex Mendonça; Pereira, Luiz Antonio Alcântara; Hirata, Miguel Hiroo

doi:10.1590/s1678-58782009000300010

Cited by 10 publications

(16 citation statements)

References 18 publications

(22 reference statements)

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“…where Δt is the temporal step, calculated from estimate velocity scale of the flow; Re is the Reynolds number of the flow (Eq. 1) and is a factor, obtained through numerical experiments in order to determine the appropriate value of the Lamb vortex element core size taking into account the influence of the method used to represent the solid boundaries [6][7][8].…”

Section: Methodsmentioning

confidence: 99%

“…The concept of such a "moving ground" has been widely used in the field of vehicle aerodynamics, especially of high-performance racing cars, to properly consider the effect of ground in the frame of reference of moving vehicles investigated, but has rarely been applied to the study of cylinders [31]. The proximity of a moving ground running at the same speed as the free stream eliminates the influence of the boundary layer formed on the ground, which is probably one of the most crucial but confusing mechanisms [6,7,26,31,35,41].…”

Section: Introductionmentioning

confidence: 99%

“…Bimbato et al [6,7] developed a methodology classified by Rashidi et al [33] as "control of vortex shedding by the other active methods". In their technique, the vortex shedding on a two-dimensional circular cylinder was controlled by using a moving ground effect at high Reynolds number flow of Re = 1.0 × 10 5 .…”

Section: Introductionmentioning

confidence: 99%

“…The key idea from Bimbato et al [6,7] was based on experimental visualizations from Nishino [31], which reported when the plane wall runs at the same speed as the free stream velocity, practically no vorticity is developed on the boundary layer formed on ground. Therefore, their numerical strategy was to represent the wall plane moving by the absence of vorticity generation on it.…”

Section: Introductionmentioning

confidence: 99%

“…The goal of this paper is to apply the methodology developed by Bimbato et al [6][7][8] to study the effect of higher surface roughness heights, which introduces greater instability in the boundary layer of circular cylinder. A detailed quantitative measurement of the flow field around the cylinder in moving ground using Lagrangian vortex method with two-dimensional modeling of roughness was carried out.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical experiments of the flow around a bluff body with and without roughness model near a moving wall

Pereira

Oliveira

Moraes

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Numerical tests at high Reynolds number flows were taken on circular cylinder placed near and parallel to a moving ground. A moving ground running at the same speed as the free stream eliminates the confusing effects of the boundary layer formed on the ground being, therefore, more effective to establish a better understanding of the relationship between complete vortex shedding suppression and surface roughness. A detailed quantitative measurement of the flow field around the cylinder using Lagrangian vortex method with roughness model was carried out. The effect of higher surface roughness heights is studied because it introduces greater instabilities in the boundary layer of bluff bodies. The purpose is to investigate supercritical flow patterns from subcritical Reynolds number flow simulations. The present results are compared against those measured for smooth cylinder under the same flow conditions. It is found that certain critical gap ratio between the rougher cylinder bottom and the moving wall significantly reduces the drag force. The lift force points away from the wall plane. The full vortex shedding suppression is successfully anticipated. In addition, the Strouhal number vanishes. The contribution of this research is to report that von Kámán-type vortex shedding totally ceases and instead two nearly parallel shear layers are formed behind the cylinder in moving ground when employing two-dimensional modeling of roughness. Previous numerical results for flow around smooth cylinder placed closer to the moving ground did not capture the behavior of Strouhal number equal to zero. Unfortunately, there is a lack of experimental results for rough cylinder near a moving wall, which motives the present study.

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Section: Methodsmentioning

confidence: 99%