Flow characteristics of two rotating side-by-side circular cylinder

Yoon, Hyun Sik; Chun, Ho Hwan; Kim, Jeong Hu; Park, I.L. Ryong

doi:10.1016/j.compfluid.2008.09.002

Cited by 42 publications

(16 citation statements)

References 44 publications

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“…[9] . Mittal et al [10] numerically studied incompressible flows past a pair of cylinders at the Reynolds numbers of 100 and 1 000 in tandem and staggered arrangements by using a stabilized finite element formulation.…”

Section: Introductionmentioning

confidence: 95%

Convective heat transfer from two rotating circular cylinders in tandem arrangement by using lattice Boltzmann method

Nemati

Farhadi

Sedighi

et al. 2012

Appl. Math. Mech.-Engl. Ed.

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The numerical investigation of the two-dimensional laminar flow past two rotating circular cylinders in the tandem arrangement is conducted by the lattice Boltzmann method. The numerical strategy is used for dealing with curved and moving boundaries of the second-order accuracy for velocity and temperature fields. The effects of various rotational speed ratios and gap spacing are studied with the Reynolds number of 100 and the Prandtl number of 0.71. A varied range of rotational speed ratios are investigated for four different gap spacing, i.e., 3.0, 1.5, 0.7, and 0.2. The results show that, for the first cylinder, the lift and drag coefficients for large gap spacing are similar to those for a single cylinder; for the second cylinder, the lift coefficient descends with the increase in the angular velocity for all gap spacing, while the drag coefficient ascends except for the gap spacing of 3.0. The results of the averaged periodic Nusselt number on the surface of the cylinders show that, for small distances between the cylinders and low angular velocities, conduction is a dominant mechanism of heat transfer, but for large distances and high angular velocities, convection is the main mechanism of heat transfer.

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Section: Introductionmentioning

confidence: 95%

Convective heat transfer from two rotating circular cylinders in tandem arrangement by using lattice Boltzmann method

Nemati

Farhadi

Sedighi

et al. 2012

Appl. Math. Mech.-Engl. Ed.

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“…By comparing the timeaveraged Nusselt numbers of the system for both adiabatic and isothermal objects, it was concluded that for high Reynolds number cases, heat transfer was independent of the shape of the object. Yoon et al [16], presented a numerical investigation of the characteristics of the two-dimensional laminar flow around two rotating circular cylinders in side-by-side arrangements. Numerical simulations are performed for various ranges of absolute rotational speeds at Reynolds number of 100.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection heat transfer in a differentially heated square enclosure with a conductive rotating circular cylinder at different vertical locations

Hussain

Hussein

2011

International Communications in Heat and Mass Transfer

140

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“…Indeed, many numerical simulations can be found for a flow past two counter-rotating side-by-side circular cylinders immersed in a uniform stream U w (then, the Reynolds number is defined not by Re ω but by Re = 2U w a/ν). Yoon et al (2007Yoon et al ( , 2009 computed the problem at Re = 100 to investigate the effect of the rotation and the gap spacing between the cylinders using an immersed-boundary method. Kang (2003) also computed, using the immersed-boundary method, the similar situation to Yoon et al (2007Yoon et al ( , 2009 and Xu, Zhou & So (2003) in a range of 40 Re 160 and showed six kinds of wake patterns behind the cylinders.…”

Section: Introductionmentioning

confidence: 99%

“…Yoon et al (2007Yoon et al ( , 2009 computed the problem at Re = 100 to investigate the effect of the rotation and the gap spacing between the cylinders using an immersed-boundary method. Kang (2003) also computed, using the immersed-boundary method, the similar situation to Yoon et al (2007Yoon et al ( , 2009 and Xu, Zhou & So (2003) in a range of 40 Re 160 and showed six kinds of wake patterns behind the cylinders. Recently, Ou et al (2009) computed the flow using a spectral difference method with an outflow velocity of U ∞ = −(a 2 1 Ω 1 /|O 1 O 2 |)e x , which was predicted by Jeffery (1922), as a far-field boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Steady approach of unsteady low-Reynolds-number flow past two rotating circular cylinders

2013

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The long-time viscous flow about two identical rotating circular cylinders in a sideby-side arrangement is investigated using an adaptive numerical scheme based on the vortex method. The Stokes solution of the steady flow about the two-cylinder cluster produces a uniform stream in the far field, which is the so-called Jeffery's paradox. The present work first addresses the validation of the vortex method for a low-Reynolds-number computation. The unsteady flow past an abruptly started purely rotating circular cylinder is therefore computed and compared with an exact solution to the Navier-Stokes equations. The steady state is then found to be obtained for t 1 with Re ω r 2 t, where the characteristic length and velocity are respectively normalized with the radius a 1 of the circular cylinder and the circumferential velocity Ω 1 a 1 . Then, the influence of the Reynolds number Re ω = a 2 1 Ω 1 /ν about the twocylinder cluster is investigated in the range 0.125 Re ω 40. The convection influence forms a pair of circulations (called self-induced closed streamlines) ahead of the cylinders to alter the symmetry of the streamline whereas the low-Reynoldsnumber computation (Re ω = 0.125) reaches the steady regime in a proper inner domain. The self-induced closed streamline is formed at far field due to the boundary condition being zero at infinity. When the two-cylinder cluster is immersed in a uniform flow, which is equivalent to Jeffery's solution, the streamline behaves like excellent Jeffery's flow at Re ω = 1.25 (although the drag force is almost zero). On the other hand, the influence of the gap spacing between the cylinders is also investigated and it is shown that there are two kinds of flow regimes including Jeffery's flow. At a proper distance from the cylinders, the self-induced far-field velocity, which is almost equivalent to Jeffery's solution, is successfully observed in a two-cylinder arrangement.

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Flow characteristics of two rotating side-by-side circular cylinder

Cited by 42 publications

References 44 publications

Convective heat transfer from two rotating circular cylinders in tandem arrangement by using lattice Boltzmann method

Convective heat transfer from two rotating circular cylinders in tandem arrangement by using lattice Boltzmann method

Mixed convection heat transfer in a differentially heated square enclosure with a conductive rotating circular cylinder at different vertical locations

Steady approach of unsteady low-Reynolds-number flow past two rotating circular cylinders

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