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Numerical investigations of lift suppression by feedback rotary oscillation of circular cylinder at low Reynolds number
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10.1063/1.3560379
/content/aip/journal/pof2/23/3/10.1063/1.3560379
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/3/10.1063/1.3560379

Figures

Image of FIG. 1.
FIG. 1.

Sketch definition of computational domain and boundary conditions.

Image of FIG. 2.
FIG. 2.

Typical computational mesh in the vicinity of circular cylinder.

Image of FIG. 3.
FIG. 3.

Time-series of drag coefficient and lift coefficient with different mesh resolutions under the extreme conditions of the present active flow control ( and ).

Image of FIG. 4.
FIG. 4.

Variations of lift components with time on stationary circular cylinder at .

Image of FIG. 5.
FIG. 5.

Comparisons of time-series of lift coefficient of rotation circular cylinder at with constant rotation ratios of , 2.5, 3.5, 4.0, 4.2, 4.4, 4.7, 4.8, and 5.0 between this work (in lines) and Mittal and Kumar (Ref. 14) (in circles). Note that the dimensionless time used in Mittal and Kumar (Ref. 14) is with the physical time.

Image of FIG. 6.
FIG. 6.

Drag force coefficients of optimal rotationally oscillating circular cylinder at , where the rotation speed follows with and and the amplitude of angular oscillation .

Image of FIG. 7.
FIG. 7.

Lift coefficients of optimal rotationally oscillating circular cylinder at , where the rotation speed follows with and and the amplitude of angular oscillation .

Image of FIG. 8.
FIG. 8.

Variation of lift amplitude with control parameter at different Reynolds numbers.

Image of FIG. 9.
FIG. 9.

Lift components under present active rotary oscillation at with .

Image of FIG. 10.
FIG. 10.

Variation of lift reduction percent with Reynolds number at different control parameter .

Image of FIG. 11.
FIG. 11.

Time-series of lift and drag coefficients under present active rotary oscillation of circular cylinder with at .

Image of FIG. 12.
FIG. 12.

Flow pattern and pressure field at with . (a) at the time instant with maximal lift coefficient. (b) at the time instant with minimal lift coefficient.

Image of FIG. 13.
FIG. 13.

Comparison of lift coefficient versus rotation ratio at between present active rotation of circular cylinder with and rotating circular cylinder with constant speeds.

Image of FIG. 14.
FIG. 14.

Evolution of vorticity field around circular cylinder at high rotation ratios with and . Solid lines denote positive while broken lines show negative vorticity. (a) t=150.69 and α=1.28. (b) t=157.03 and α=2.92. (c) t=158.54 and α=3.66. (d) t=161.05 and α=4.66. (e) t=166.06 and α=6.51.

Image of FIG. 15.
FIG. 15.

Variation of critical rotation ratio with Reynolds number.

Image of FIG. 16.
FIG. 16.

Comparisons of Strouhal number versus Reynolds number between stationary circular cylinder and active rotationally oscillating circular cylinder. Note that formula (1): and formula (2): .

Image of FIG. 17.
FIG. 17.

Spectrum analysis for vortex shedding frequency of present active flow control, with , and forced harmonic rotary oscillation of cylinder, with and , at .

Image of FIG. 18.
FIG. 18.

Comparison of vorticity fields for stationary cylinder, present active rotary oscillation and forced harmonic rotary oscillation with . (a) Stationary circular cylinder at Re=200. (b) Present active rotary oscillation at Re=200 and =0.88. (c) Harmonic rotary oscillation at Re=200 with =6 and =0.75.

Image of FIG. 19.
FIG. 19.

Evolution of flow field and pressure field for stationary circular cylinder at . (a) with maximum of negative lift coefficient. (b) with zero lift coefficient. (c) with maximum of positive lift coefficient.

Image of FIG. 20.
FIG. 20.

Evolution of flow field and pressure field for active rotationally oscillating circular cylinder at with . (a) with maximum of negative lift coefficient. (b) with zero lift coefficient. (c) with maximum of positive lift coefficient.

Tables

Generic image for table
Table I.

Comparisons of numerical results with different mesh resolutions.

Generic image for table
Table II.

Comparisons of mean drag coefficient at different Reynolds numbers.

Generic image for table
Table III.

Comparisons of amplitude of lift coefficient at different Reynolds numbers.

Generic image for table
Table IV.

Comparison of Strouhal number St at different Reynolds numbers.

Generic image for table
Table V.

Threshold of control parameter for various Reynolds.

Generic image for table
Table VI.

Mean drag force at various Re and .

Generic image for table
Table VII.

Strouhal number at different Re and .

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/content/aip/journal/pof2/23/3/10.1063/1.3560379
2011-03-15
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Numerical investigations of lift suppression by feedback rotary oscillation of circular cylinder at low Reynolds number
http://aip.metastore.ingenta.com/content/aip/journal/pof2/23/3/10.1063/1.3560379
10.1063/1.3560379
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