On uniform planar shear flow around a circular cylinder at subcritical Reynolds number

2003 ◽  
Vol 18 (3-4) ◽  
pp. 441-454 ◽  
Author(s):  
D. Sumner ◽  
O.O. Akosile
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Shear Flow ◽  
Planar Shear

On a Circular Cylinder in a Uniform Planar Shear Flow at Subcritical Reynolds Number

2002 ◽  
Author(s):  
D. Sumner ◽  
O. O. Akosile
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Shear Flow ◽  
Lift Force ◽  
Experimental Studies ◽  
Reynolds Numbers ◽  
Low Velocity ◽  
Static Pressure Distribution ◽  
Planar Shear ◽  
The Mean

An experimental investigation was conducted of a circular cylinder immersed in a uniform planar shear flow, where the approach velocity varies across the diameter of the cylinder. The study was motivated by some apparent discrepancies between numerical and experimental studies of the flow, and the general lack of experimental data, particularly in the subcritical Reynolds number regime. Of interest was the direction and origin of the steady mean lift force experienced by the cylinder, which has been the subject of contradictory results in the literature, and for which measurements have rarely been reported. The circular cylinder was tested at Reynolds numbers from Re = 4.0×104 − 9.0×104, and the dimensionless shear parameter ranged from K = 0.02 − 0.07, which corresponded to a flow with low to moderate shear. The results showed that low to moderate shear has no appreciable influence on the Strouhal number, but has the effect of lowering the mean drag coefficient. The circular cylinder develops a small steady mean lift force directed towards the low-velocity side, which is attributed to an asymmetric mean static pressure distribution on its surface. The reduction in the mean drag force, however, cannot be attributed solely to this asymmetry.

Vortex shedding from a circular cylinder in moderate-Reynolds-number shear flow

1980 ◽  
Vol 101 (4) ◽  
pp. 721-735 ◽  
Author(s):  
Masaru Kiya ◽  
Hisataka Tamura ◽  
Mikio Arie
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Shear Flow ◽  
Vortex Shedding ◽  
Transverse Velocity ◽  
Number Range ◽  
Uniform Shear ◽  
Reynolds Number Range ◽  
Moderate Reynolds Number ◽  
Shear Parameter

The frequency of vortex shedding from a circular cylinder in a uniform shear flow and the flow patterns around it were experimentally investigated. The Reynolds number Re, which was defined in terms of the cylinder diameter and the approaching velocity at its centre, ranged from 35 to 1500. The shear parameter, which is the transverse velocity gradient of the shear flow non-dimensionalized by the above two quantities, was varied from 0 to 0·25. The critical Reynolds number beyond which vortex shedding from the cylinder occurred was found to be higher than that for a uniform stream and increased approximately linearly with increasing shear parameter when it was larger than about 0·06. In the Reynolds-number range 43 < Re < 220, the vortex shedding disappeared for sufficiently large shear parameters. Moreover, in the Reynolds-number range 100 < Re < 1000, the Strouhal number increased as the shear parameter increased beyond about 0·1.

Numerical simulation of Reynolds number effects on velocity shear flow around a circular cylinder

2010 ◽  
Vol 26 (5) ◽  
pp. 685-702 ◽  
Author(s):  
Shuyang Cao ◽  
Shigehira Ozono ◽  
Yukio Tamura ◽  
Yaojun Ge ◽  
Hironori Kikugawa
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Circular Cylinder ◽  
Shear Flow ◽  
Velocity Shear ◽  
Reynolds Number Effects

Flow-induced vibration on a circular cylinder in planar shear flow

2014 ◽  
Vol 105 ◽  
pp. 138-154 ◽  
Author(s):  
Jiahuang Tu ◽  
Dai Zhou ◽  
Yan Bao ◽  
Congqi Fang ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Circular Cylinder ◽  
Shear Flow ◽  
Flow Induced Vibration ◽  
Planar Shear

End-wall effects on vortex shedding in planar shear flow over a circular cylinder

2011 ◽  
Vol 42 (1) ◽  
pp. 102-107 ◽  
Author(s):  
Zhiyong Huang ◽  
Helge I. Andersson ◽  
Weicheng Cui
Keyword(s):  
Circular Cylinder ◽  
Shear Flow ◽  
Vortex Shedding ◽  
Wall Effects ◽  
Planar Shear ◽  
End Wall

scholarly journals Multi-relaxation-time Lattice Boltzman model for uniform-shear flow over a rotating circular cylinder

2011 ◽  
Vol 15 (3) ◽  
pp. 859-878 ◽  
Author(s):  
Hasan Nemati ◽  
Mousa Farhadi ◽  
Kurosh Sedighi ◽  
Ehsan Fattahi
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Relaxation Time ◽  
Circular Cylinder ◽  
Rotational Speed ◽  
Speed Ratio ◽  
Nusselt Numbers ◽  
Rotating Circular Cylinder ◽  
Flow And Heat Transfer ◽  
Planar Shear

A numerical investigation of the two-dimensional laminar flow and heat transfer a rotating circular cylinder with uniform planar shear, where the free-stream velocity varies linearly across the cylinder using Multi-Relaxation-Time Lattice Boltzmann method is conducted. The effects of variation of Reynolds number, rotational speed ratio at shear rate 0.1, blockage ratio 0.1 and Prandtl number 0.71 are studied. The Reynolds number changing from 50 to 160 for three rotational speed ratios of 0, 0.5, 1 is investigated. Results show that flow and heat transfer depends significantly on the rotational speed ratio as well as the Reynolds number. The effect of Reynolds number on the vortex-shedding frequency and period-surface Nusselt numbers is overall very strong compared with rotational speed ratio. Flow and heat conditions characteristics such as lift and drag coefficients, Strouhal number and Nusselt numbers are studied.

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