대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제30권5호
  • /
  • Pages.480-488
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  • 2006
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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직렬로 배열된 두 개의 구를 지나는 층류 유동

Laminar Flow over Two Spheres in a Tandem Arrangement

  • 김동주 (금오공과대학 기계공학부)
  • 발행 : 2006.05.01
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초록

Numerical simulations of flow over two spheres placed in a tandem arrangement are conducted to investigate the effect of the inter-sphere spacing on the flow characteristics. The Reynolds numbers considered are 100, 250, 300 and 425, corresponding to steady axisymmetric, steady planar-symmetric, unsteady planar-symmetric, and unsteady asymmetric flows, respectively, in the case of a single sphere. For small inter-sphere spacings, the flow past two spheres is more stable than that past a single sphere. For example, with the spacing of the sphere radius, the flow is steady axisymmetric up to Re=300. However, for relatively large spacings, the flow past two spheres becomes unstable and vortex shedding takes place even at Re=250. The drag coefficient of the rear sphere decreases significantly with decreasing inter-sphere spacing due to reduction of the stagnation pressure, thus being smaller than that of the front sphere. Also, the rear sphere shows large fluctuations of the lift force as compared to the front one in the case of unsteady flow.

키워드

참고문헌

  1. Fornberg, B., 1988, 'Steady Viscous Flow Past a Sphere at High Reynolds Numbers,' J. Fluid Mech., Vol. 190, pp. 471-489 https://doi.org/10.1017/S0022112088001417
  2. Sakamoto, H. and Haniu, H., 1990, 'A Study on Vortex Shedding from Spheres in a Uniform Flow,' J. Fluids Eng., Vol. 112, pp. 386-392 https://doi.org/10.1115/1.2909415
  3. Johnson, T. A. and Patel, V. c, 1999, 'Flow Past a Sphere up to a Reynolds Number of 300,' J. Fluid Mech., Vol. 378, pp. 19-70 https://doi.org/10.1017/S0022112098003206
  4. Mittal, R., 1999, 'Planar Symmetry in the Unsteady Wake of a Sphere,' AIAA J., Vol. 37, No.3, pp. 388~390 https://doi.org/10.2514/2.722
  5. Constantinescu, G. S., Chaplet, M. and Squires, K., 2003, 'Turbulence Modeling Applied to Flow over a Sphere,' AIAA J., Vol. 41, No.9, pp. 1733-1742 https://doi.org/10.2514/2.7291
  6. Tomboulides, A. G. and Orszag, S. A., 2000, 'Numerical Investigation of Transitional and Weak Turbulent Flow' Past a Sphere,' J. Fluid Mech., Vol. 416, pp. 45-73 https://doi.org/10.1017/S0022112000008880
  7. Kim, D. and Choi, H., 2002, 'Laminar Flow Past a Sphere Rotating in the Streamwise Direction,' J. Fluid Mech., Vol. 461, pp. 365-386 https://doi.org/10.1017/S0022112002008509
  8. Yun, G., Choi, H. and Kim, D., 2003, 'Turbulent Flow Past a Sphere at Re=3700 and $10^4$,' Phys. Fluids, Vol. 15, No.9, S6 https://doi.org/10.1063/1.4739210
  9. Lee, K. C., 1979, 'Aerodynamic Interaction Between Two Spheres at Reynolds Numbers Around $10^4$,' Aeronautical Quarterly, Vol. 30, pp. 371-385 https://doi.org/10.1017/S000192590000857X
  10. Tsuji, Y., Morikawa, Y. and Terashima, K., 1982, 'Fluid-dynamic Interaction Between Two Spheres,' Int. J. Multiphase Flow, Vol. 8, pp. 71-82 https://doi.org/10.1016/0301-9322(82)90008-8
  11. Kim, I., Elghobashi, S. and Sirignano, W. A., 1993, 'Three-dimensional Flow over Two Spheres Placed Side by Side,' J. Fluid Mech., Vol. 246, pp. 465-488 https://doi.org/10.1017/S0022112093000229
  12. Zhu, C., Liang, S.-C. and Fan, L.-S., 1994, 'Particle Wake Effects on the Drag Force of an Interactive Particle,' Int. J. Multiphase Flow, Vol. 20, pp. 117-129 https://doi.org/10.1016/0301-9322(94)90009-4
  13. Liang, S.-C, Hong, T. and Fan, L.-S., 1996, 'Effects of Particle Arrangements on the Drag Force of a Particle in the Intermediate Flow Regime,' Int. J. Multiphase Flow, Vol. 22, No.2, pp. 285-306 https://doi.org/10.1016/0301-9322(95)00070-4
  14. Chen, R. C. and Lu, Y. N., 1999, 'The Flow Characteristics of an Interactive Particle at Low Reynolds Numbers,' Int. J. Multiphase Flow, Vol. 25, pp. 1645-1655 https://doi.org/10.1016/S0301-9322(98)00082-2
  15. Tsuji, T., Narutomi, R., Yokomine, T., Ebara, S. and Shimizu, A., 2003, 'Unsteady Three-dimensional Simulation of Interactions Between Flow and Two Particles,' Int. J. Multiphase Flow, Vol. 29, pp. 1431-1450 https://doi.org/10.1016/S0301-9322(03)00137-X
  16. Kim, J., Kim, D. and Choi, H., 2001, 'An Immersed Boundary Finite-volume Method for Simulations of Flow in Complex Geometries,' J. Comput. Phys., Vol. 171, pp. 132-150 https://doi.org/10.1006/jcph.2001.6778
  17. Jeong, J. and Hussain, F., 1995, 'On the Identification of a Vortex,' J. Fluid Mech., Vol. 285, pp. 69-94 https://doi.org/10.1017/S0022112095000462
  18. Kim, D. and Choi, H., 2003, 'Laminar Flow Past a Hemisphere,' Phys. Fluids, Vol. 15, No. 8, pp. 2457-2460 https://doi.org/10.1063/1.1589485

피인용 문헌

  1. Analysis of Laminar Flows around Submerged Spheres vol.34, pp.8, 2010, https://doi.org/10.5916/jkosme.2010.34.8.1094