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Research Papers: Flows in Complex Systems

Radial Deformation Frequency Effect on the Three-Dimensional Flow in the Cylinder Wake

[+] Author and Article Information
Mohamed Aissa

CDER/Unit of Applied Research
in Renewable Energy (CDER/URAER),
Ghardaia 47133, Algeria
e-mail: mohamed.aissa28@yahoo.fr

Ahcène Bouabdallah

LTSE University of Sciences and Technology
Houari Boumedienne (USTHB),
Algiers 16111, Algeria
e-mail: abouab2002@yahoo.fr

Hamid Oualli

Fluid Mechanic Laboratory,
School Military Polytechnic (EMP),
Bordj El-Bahri 16045, Algeria
e-mail: houalli@gmail.com

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 6, 2014; final manuscript received July 10, 2014; published online September 10, 2014. Assoc. Editor: Mark F. Tachie.

J. Fluids Eng 137(1), 011104 (Sep 10, 2014) (11 pages) Paper No: FE-14-1008; doi: 10.1115/1.4028008 History: Received January 06, 2014; Revised July 10, 2014

In the current paper, the three-dimensional air flow evolution around a circular cylinder is studied. The main aim is to control the flow field upstream and downstream of a circular cylinder by means of radial deformation. Within a particular step, one focuses on the response of the topological structures, which is developing in the cylinder near wake to applied pulsatile motion. Furthermore, a special care is considered to the aerodynamics forces behavior in adjusting the applied controlling strategy. The used controlling frequency range extends from f = 1fn = 17 Hz to f = 6fn = 102.21 Hz, which corresponds to a series of multiharmonic frequency varying from one to six times the natural vortex shedding frequency (VSF) in none forced wake. Throughout this work, the forcing amplitude is fixed at 16% of cylinder diameter and the Reynolds number as Re = 550. Through Fluent computational fluid dynamics (CFD) code and Matlab simulations, the obtained results showed a good accordance with the calculated ones.

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References

Figures

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Fig. 1

Flow domain and boundary conditions

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Fig. 2

Two-dimensional coordinate system and cylinder deformation process

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Fig. 3

3D Computational mesh

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Fig. 4

Sinusoidal drag coefficient signal Re = 100

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Fig. 5

Spectral analysis of drag coefficient signal at Re = 100

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Fig. 6

Results comparison for an impulsively started cylinder at t = 5.00 and Re = 500. Results of Koumoutsakos et al. [52] (a) equivorticity lines and (b) instantaneous streamlines. Coutenceau and Bouard [54] experimental results (c) streamlines. Oualli et al. [53]. (d) equivorticity lines. Present results (e) equivorticity lines.

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Fig. 7

Natural Case: Vorticity contours (s−1) for Re = 550 at t = 0.988 s and t = 2.67 s

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Fig. 8

Vorticity contours (s−1) at relaminarized flow for Re = 550 and (f = 1Fn, f = 3Fn, and f = 4Fn)

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Fig. 9

Vortex shedding and von Kàrmàn street at f = 5Fn = 85 Hz

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Fig.10

Bénard von Kàrmàn vortex street in three-dimensional flow mode-B, respectively, at f = 2Fn = 34 Hz and f = 6Fn = 102 Hz

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Fig. 11

Kelvin Helmholtz eddies formation at f = 34 Hz and f = 102 Hz cases

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Fig. 12

Cross vortex boundary layer formation, respectively, at f = 34 Hz and f = 102 Hz cases

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Fig. 13

Evolution of the mean drag coefficient (CD) and mean lift coefficient (CL) versus the radial deformation frequency

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Fig. 14

Drag coefficient spectrum analysis (f = 0 Hz and f = 34 Hz) and lock-on phenomenon, Re = 550

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