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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Freestream Turbulence Intensity on the Flow Past a Circular Cylinder

원형단면 실린더를 지나는 유동에 대한 자유류 난류강도의 영향

  • 황종연 (인하대학교 대학원 기계공학과) ;
  • 양경수 (인하대학교 기계공학부) ;
  • 이승수 (충북대학교 구조시스템공학과) ;
  • 이준식 (서울대학교 기계항공공학부) ;
  • 이상산 (KISTI 수퍼컴퓨팅 센터)
  • Published : 2004.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the effects of freestream turbulence intensity on laminar-turbulent transition of separated shear layers in the wake of a circular cylinder are investigated using an immersed boundary method and LES. It is shown that the present numerical results without freestream turbulence for Re=3,900 based on bulk mean velocity and the cylinder diameter are in good agreement with other authors' experimental observations and numerical results, verifying our numerical methodology. Then a 'prescribed power spectrum' method is imposed to generate isotropic turbulence at the inlet of the computational domain at each time step. The principal effects of freestream turbulence intensity on flow statistics are investigated for Re=3,900. Statistical study reveals that the Reynolds stresses in the near-wake region gradually increase, and transition occurs further upstream, as the turbulence intensity increases. On the other hand, the bubble size behind the cylinder decreases as the turbulence intensity increases, which indicates that the freestream turbulence helps mean velocity be quickly recovered.

Keywords

References

  1. Bloor, M. S., 1964, 'The Transition to Turbulence in the Wake of a Circular Cylinder,' J. Fluid Mech., Vol. 19, pp. 290-304 https://doi.org/10.1017/S0022112064000726
  2. Matsumura, M. and Antonia, R. A., 1993, 'Momentum and Heat Transport in the Turbulent Intermediate Wake of a Circular Cylinder,' J. Fluid Mech., Vol. 250, pp. 651-668 https://doi.org/10.1017/S0022112093001600
  3. Peskin, C. S., 1982, 'The Fluid Dynamics of Heart Valve: Experimental, Theoretical, and Computational Methods,' Ann. Rev. Fluid Mech., Vol. 14, pp. 235-259 https://doi.org/10.1146/annurev.fl.14.010182.001315
  4. Kim, J., Kim, D. and Choi, H., 2001, 'An Immersed-Boundary Finite-Volume Method for Simulations of Flow in Complex Geometries,' Journal of Computational Physics, Vol. 171, pp. 132-150 https://doi.org/10.1006/jcph.2001.6778
  5. Yang, K.-S. and Ferziger, J. H., 1993, 'Large-Eddy Simulation of Turbulent Obstacle Flow Using a Dynamic Subgrid-Scale Model,' AIAA J., Vol. 31. No. 8. pp. 1406-1423 https://doi.org/10.2514/3.49081
  6. Kravchenko, A. G. and Moin. P., 2000, 'Numerical Studies of Flow Over a Circular Cylinder at $Re_D=3900$,' Physics of Fluids, Vol. 12, No. 2, pp. 403-417 https://doi.org/10.1063/1.870318
  7. Kim, K. C., Yoon, S. Y. and Kim, S. K., 1999, 'Measurements of the Plane Turbulent Near Wake of a Circular Cylinder Using a PIV Method,' Autumn Conference of the Div. of Fluid Engineering of KSME, pp. 227-233
  8. Lourenco, L. M. and Shih, C., 1993, 'Characteristics of the Plane Turbulent Near Wake of a Circular Cylinder,' Personal Communication
  9. Norberg, C., 1987, 'Effects of Reynolds Number and Low-Intensity Freestream Turbulence on the Flow Around a Circular Cylinder,' Publications No. 87/2, Dept. of Applied Thermodynamics and Fluid Mechanics, Chalmer Univ. of Technology, Gothemburg, Sweden
  10. Son, J. and Hanratty, T. J., 1969, 'Velocity Gradients at the Wall for Flow Around a Cylinder at Reynolds Numbers from $5{\times}10^3\;to\;10^5$,' J. Fluid Mech., Vol. 35, pp. 353-368 https://doi.org/10.1017/S0022112069001157
  11. Cardell, G. S., 1993, 'How Past a Circular Cylinder with a Permeable Splitter Plate,' Ph.D. Thesis, Graduate Aeronautical Laboratories, California Institute of Technology
  12. Beaudan, P. and Moin, P., 1994, 'Numerical Experiments on the Flow Past a Circular Cylinder at Sub-Critical Reynolds Number,' Report No. TF-62, Thermosciences Div., Dept. of Mech. Engr., Stanford Univ.
  13. Choi, H. and You, D. H., 2000, 'Large Eddy Simulation of Turbulent Flow Over a Circular Cylinder,' Personal Communication
  14. Kravchenko, A. G. and Moin, P., 1998, 'B-Spline Methods and Zonal Grids for Numerical Simulations of Turbulent Flows,' Report No. TF-73. Dept. of Mechanical Engineering, Stanford University
  15. Lee, S., Moin, P. and Lele, S. K., 1992, 'Interaction of Isotropic Turbulence with a Shock Wave,' TF-52, Thermosciences Div., Dept. of Mech. Engr., Stanford Univ.
  16. Leem, Y., Sohn, D. K., Lee, J. S. and Yang, K-.S., 1998, 'An Experimental Study of Flow Separation Around a Circular Cylinder with Reynolds Number and Free Stream Turbulence Intensity Variations,' Trans. of the KSME B, Vol. 22, No. 7, pp. 889-898