Flow past a rotating cylinder

Mittal, B. Sanjay; Kumar, B. V. Rathish

doi:10.1017/s0022112002002938

Cited by 420 publications

(395 citation statements)

References 33 publications

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“…Figures 3 and 4 show that the dimensionless vorticity and pressure coefficient for Re = 200 with α= 0, 3 and 4 are in good agreement, with slightly less good agreement for Re = 200 and α = 4 where the pressure coefficient on the upper surface of the cylinder is slightly disturbed. This behaviour may be related to the differences between our results and those of Mittal and Kumar (2003) for the drag coefficient.…”

Section: Comparison With Other Resultscontrasting

confidence: 89%

“…This comparison was performed with the numerical results of Mittal & Kumar (2003) for Re = 200. The outcomes included in the comparison were the lift and drag coefficients, as well as the dimensionless vorticity and pressure coefficient on the surface of the rotating circular cylinder.…”

Section: Comparison With Other Resultsmentioning

confidence: 99%

“…All the meshes, M1 to M5, have the same distribution of nodes close to the cylinder. Kang et al (1999), while Mittal & Kumar (2003) used a dimensionless time step of 0.0125. Since the segregated method selected from the solver is implicit, no dependency on the time step occured in terms of numerical stability.…”

Section: Domain Independence Studymentioning

confidence: 99%

“…The effect of the spatial resolutions was investigated via computations with meshes M5 and M5b, which have the same domain size (H/Dt = 125). We assign the value recommended by Mittal & Kumar (2003) for the radial step size of the first layer of cells (i.e. cells attached to the wall), hDt/Dt = 0.0025.…”

Section: Domain Independence Studymentioning

confidence: 99%

“…The flow around a rotating circular cylinder with a constant angular velocity, placed in a uniform stream, was investigated by Stojkovic et al (2002) at Re = 60, 100 and 200, Mittal and Kumar (2003) at Re = 200 found two more flow transitions: a second transition from steady to unsteady flow at α L2 and a third transition at α > α L3 where unsteady flow is again suppressed. They found the second unsteady flow mode in a very narrow range of (α L2 ≤ α ≤ α L3 ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Bouakkaz

Talbi

Ouazzazi

et al. 2015

Braz. J. Chem. Eng.

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-In this work, forced convection heat transfer past a rotating circular cylinder with a constant nondimensional rotation rate α varying from 0 to 6 was investigated for Reynolds numbers of 20-200 and a Prandtl number of 0.7. The numerical calculations are carried out by using a finite-volume method based commercial computational fluid dynamics solver FLUENT. The successive changes in the flow pattern are studied as a function of the rotation rate. Suppression of vortex shedding occurs as the rotation rate increases (α > 2). A second kind of instability appears for higher rotation speed where a series of counter-clockwise vortices is shed in the upper shear layer. The rotation attenuates the secondary instability and increases the critical Reynolds number for the appearance of this instability. In addition, time-averaged (lift and drag coefficients and Nusselt number) results were obtained and compared with the literature data. A good agreement was obtained for both the local and averaged values.

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Section: Comparison With Other Resultscontrasting

confidence: 89%

Section: Comparison With Other Resultsmentioning

confidence: 99%

Section: Domain Independence Studymentioning

confidence: 99%

Section: Domain Independence Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Bouakkaz

Talbi

Ouazzazi

et al. 2015

Braz. J. Chem. Eng.

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Excitation of shear layer instability in flow past a cylinder at low Reynolds number

Mittal

2005

Numerical Methods in Fluids

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SUMMARYThe instability of the separated shear layer for ow past a cylinder, in two dimensions, is investigated for low Reynolds numbers (Re 6 350). The line of symmetry, downstream of the cylinder, in the wake is forced to be a streamline. This hypothetical situation allows slip of velocity along the wake centreline but prevents any ow normal to it. With this arrangement the ow is completely stable for Re 6 250. It suppresses the primary instability of the wake that is responsible for the von Karman vortex shedding. Unlike the conventional splitter plate such an arrangement does not have a wake of its own. At Re = 300 and above the wake instability and the shear layer instability are observed. The uctuations due to the instabilities are intermittent in nature. The shear layer frequency is smaller than the frequency of the von Karman vortex shedding for the regular ow past a cylinder. It is also found that ow past half a cylinder, with symmetry conditions at the wake centreline, at Re = 300 is stable. However, when a secondary cylinder with one-ÿfth the diameter of the half-cylinder is placed close to it, the vortex shedding from the smaller cylinder again leads to instability of the separated shear layer of the half-cylinder. This suggests that although the separated shear layer is stable, at such low Re, the shear layer instability can be excited by some other disturbances. It is found that even at such low Re, the normalized shear layer frequency follows the Re 0:67 power law. All the computations have been carried out using a stabilized ÿnite element formulation.

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Effect of blockage on critical parameters for flow past a circular cylinder

Kumar

Mittal

2006

Int. J. Numer. Meth. Fluids

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SUMMARYThe e ect of location of the lateral boundaries, of the computational domain, on the critical parameters for the instability of the ow past a circular cylinder is investigated. Linear stability analysis of the governing equations for incompressible ows is carried out via a stabilized ÿnite element method to predict the primary instability of the wake. The generalized eigenvalue problem resulting from the ÿnite element discretization of the equations is solved using a subspace iteration method to get the most unstable eigenmode. Computations are carried out for a large range of blockage, 0:005 6 D=H 6 0:125, where D is the diameter of the cylinder and H is the lateral width of the domain. A non-monotonic variation of the critical Re with the blockage is observed. It is found that as the blockage increases, the critical Re for the onset of the instability ÿrst decreases and then increases. However, a monotonic increase in the non-dimensional shedding frequency at the onset of instability, with increase in blockage, is observed. The increased blockage damps out the low-frequency modes giving way to higher frequency modes. The blockage is found to play an important role in the scatter in the data for the non-dimensional vortex shedding frequency at the onset of the instability, from various researchers in the past.

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Flow past a rotating cylinder

Cited by 420 publications

References 33 publications

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Effect of Rotation Rates on the Laminar Flow and Heat Transfer Past a Circular Cylinder

Excitation of shear layer instability in flow past a cylinder at low Reynolds number

Effect of blockage on critical parameters for flow past a circular cylinder

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