ISSN 0253-2778

CN 34-1054/N

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LES of uniform flow over tandem circular disks

  • Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China

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https://doi.org/10.3969/j.issn.0253-2778.2017.05.009
  • Received Date: 09 September 2016
  • Rev Recd Date: 28 February 2017
  • Publish Date: 31 May 2017
    Abstract

  • Abstract

    A large eddy simulation(LES) was conducted to investigate the uniform flow over tandem disks at low Reynolds number,mainly focusing on the influence of separation distance on wake structure.The results show that the Hopf bifurcation of flow field is delayed compared with that of a single disk when the distance between the two disks is small enough.The research was performed at Re=200 with distances l/d=1,1.5,2,3 and 6, respectively. It is concluded that the wake is stable and plane-symmetrical at l/d=1 and unstable but plane-symmetrical at  l/d=1.5. At l/d=2, the plane-symmetrical structure is broken.The upstream wake resumes plane-symmetry at l/d=3 while the wake of both disks resume plane-symmetry at l/d=6.

    Abstract

    A large eddy simulation(LES) was conducted to investigate the uniform flow over tandem disks at low Reynolds number,mainly focusing on the influence of separation distance on wake structure.The results show that the Hopf bifurcation of flow field is delayed compared with that of a single disk when the distance between the two disks is small enough.The research was performed at Re=200 with distances l/d=1,1.5,2,3 and 6, respectively. It is concluded that the wake is stable and plane-symmetrical at l/d=1 and unstable but plane-symmetrical at  l/d=1.5. At l/d=2, the plane-symmetrical structure is broken.The upstream wake resumes plane-symmetry at l/d=3 while the wake of both disks resume plane-symmetry at l/d=6.
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    • References(10)
  • [1]
    CHEN R C, LU Y N. The flow characteristics of an interactive particle at low Reynolds numbers[J]. International Journal of Multiphase Flow, 1999, 25(8): 1645-1655.
    [2]
    TSUJI T, NARUTOMI R, YOKOMINET, et al. Unsteady three-dimensional simulation of interactions between flow and two particles[J]. International Journal of Multiphase Flow, 2003, 29(9): 1431-1450.
    [3]
    ZOU J F, REN A L, DENG J. Study on flow past two spheres in tandem arrangement using a local mesh refinement virtual boundary method[J]. International Journal for Numerical Methods in Fluids, 2005, 49(5): 465-488.
    [4]
    ZOU J F, REN A L, DENG J, et al. Wake structures of two spheres in tandem arrangement at various gaps for Re= 300 [J]. Progress in Natural Science, 2005, 15(2): 19-23.
    [5]
    VOTH G A. Disks aligned in a turbulent channel[J]. Journal of Fluid Mechanics, 2015, 772: 1-4.
    [6]
    EIFFEL G. The resistance of the air and aviation experiments: conducted at the Champ-de-Mars laboratory[M]. Constable, 1913.
    [7]
    MOREL T, BOHNM. Flow over two circular disks in tandem[J]. Journal of Fluids Engineering, 1980, 102(1): 104-111.
    [8]
    YANG J Z, WU G, ZHONG W, et al. Numerical study on bifurcations in the wake of a circular disk[J]. International Journal of Computational Fluid Dynamics, 2014, 28(5): 187-203.
    [9]
    TOMBOULIDES A G, ORSZAG S A. Numerical investigation of transitional and weak turbulent flow past a sphere[J]. Journal of Fluid Mechanics, 2000, 416(1): 45-73.
    [10]
    FERNANDES P C, RISSO F, ERN P, et al. Oscillatory motion and wake instability of freely rising axisymmetric bodies[J]. Journal of Fluid Mechanics, 2007, 573: 479-502.
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    [1]
    CHEN R C, LU Y N. The flow characteristics of an interactive particle at low Reynolds numbers[J]. International Journal of Multiphase Flow, 1999, 25(8): 1645-1655.
    [2]
    TSUJI T, NARUTOMI R, YOKOMINET, et al. Unsteady three-dimensional simulation of interactions between flow and two particles[J]. International Journal of Multiphase Flow, 2003, 29(9): 1431-1450.
    [3]
    ZOU J F, REN A L, DENG J. Study on flow past two spheres in tandem arrangement using a local mesh refinement virtual boundary method[J]. International Journal for Numerical Methods in Fluids, 2005, 49(5): 465-488.
    [4]
    ZOU J F, REN A L, DENG J, et al. Wake structures of two spheres in tandem arrangement at various gaps for Re= 300 [J]. Progress in Natural Science, 2005, 15(2): 19-23.
    [5]
    VOTH G A. Disks aligned in a turbulent channel[J]. Journal of Fluid Mechanics, 2015, 772: 1-4.
    [6]
    EIFFEL G. The resistance of the air and aviation experiments: conducted at the Champ-de-Mars laboratory[M]. Constable, 1913.
    [7]
    MOREL T, BOHNM. Flow over two circular disks in tandem[J]. Journal of Fluids Engineering, 1980, 102(1): 104-111.
    [8]
    YANG J Z, WU G, ZHONG W, et al. Numerical study on bifurcations in the wake of a circular disk[J]. International Journal of Computational Fluid Dynamics, 2014, 28(5): 187-203.
    [9]
    TOMBOULIDES A G, ORSZAG S A. Numerical investigation of transitional and weak turbulent flow past a sphere[J]. Journal of Fluid Mechanics, 2000, 416(1): 45-73.
    [10]
    FERNANDES P C, RISSO F, ERN P, et al. Oscillatory motion and wake instability of freely rising axisymmetric bodies[J]. Journal of Fluid Mechanics, 2007, 573: 479-502.
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