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Experimental and Numerical Study for the Cross-flow around Four Cylinders in an In-line Square Configuration

Lam, K.    (Department of Mechanical Engineering, The Hong Kong Polytechnic University   ); Zou, L.    (School of Mechanical and Electronic Engineering, Wuhan University of Technology  );
  • 초록

    The cross-flow around four cylinders in an in-line square configuration with the spacing ratio (L/D) 1.5, 2.5, 3.5 and 5.0 have been investigated experimentally using Laser Doppler Anemometer (LDA) and Digital Particle Image Velocimetry (DPIV). The experiments were carried out in a closed-loop wind tunnel with Reynolds number $1.128{\times}10^4\;to\;1.982{\times}10^4$ . Mean velocity distributions are obtained by LDA. The full field instantaneous and averaged velocity and vorticity components are measured by DPIV. The present experimental study indicated that several distinct flow patterns exist. Distinct vortex shedding of the upstream cylinders was suppressed for L/D $Re=1.128{\times}10^4$ . The flow patterns are affected by the spacing ratio and Re. In order to capture the details of the 3-D vortices structures and obtain all the instantaneous physical information, 3-D numerical simulations of the cross-flow around the four cylinders in an in-line square configuration with the spacing ratio 1.5 and 3.5, and $Re=1.50{\times}10^4$ are carried out using large eddy simulation(LES). The numerical results are in good agreement with the experimental results. These results provided full field instantaneous information of the flow structures, velocity field and vorticity field of cross-flow around the four cylinders in an in-line square configuration.


  • 주제어

    Four cylinders .   Flow pattern .   LDA .   DPIV .   LES.  

  • 참고문헌 (12)

    1. Farrant, T., Tan, M. and Price, W. G., 2000, 'A Cell Boundary Element Method applied to Laminar Vortex-Shedding from Arrays of Cylinders in Various Arrangements,' Journal of Fluids and Structures, Vol. 14, pp. 375-402 
    2. Lam, K., Li, J. Y., Chan, K. T. and So, R. M. C., 2002, 'The Flow Patterns of Cross Flow around Four Cylinders in an In-line Square Configuration,' The Tenth International Symposium on Flow Visualization, Kyoto, Japan 
    3. Lam, K. and Fang, X., 1995, 'The Effect of Interference of four Equispaced Cylinders in Cross Flow on Pressure and Force Coefficients,' Journal of Fluids and Structures, Vol. 9, pp. 195-214 
    4. Sumner, D., Price, S. J. and Paidoussis, M. P., 2000, 'Flow-Pattern Identification for Two Staggered Circular Cylinders in Cross-flow,' Journal of Fluid Mechanics, Vol. 411, pp. 263-303 
    5. Lam, K. and Lo, S. C., 1992, 'A Visualization Study of Cross-flow around Four Cylinders in a Square Configuration,' Journal of Fluids and Structures, Vol. 6, pp. 109-13 
    6. Park, C. W. and Lee, S. J., 2003, 'Flow Structure around Two Finite Circular Cylinders Located in an Atmospheric Boundary layer: Side-by-side arrangement,' Journal of Fluids and Structures, Vol. 17, pp. 1043-1968 
    7. Lam, K., Wang, F. H. and So, R. M. C., 2004, 'ThreeDimensional Nature of Vortices in the near Wake of a Wavy Cylinder,' Journal of Fluids and Structures, Vol. 19, pp.815-833 
    8. Akilli, H., Akar, A. and Karakus, C., 2004, 'Flow Characteristics of Circular Cylinders arranged Side-byside in Shallow Water,' Flow Measurement and Instrumentation, Vol. 15, pp. 187-197 
    9. Norberg, C., 1998, 'LDV-measurements in the Near Wake of a Circular Cylinder,' In: Proceedings of the 1998 ASME Fluids Engineering Division Summer Meeting, Washington, DC, FED-Vol. 245, FEA-SM98-5202 
    10. Sayers, A. T., 1990, 'Vortex Shedding from Groups of Three and Four Equispaced Cylinders Situated in Cross-flow,' Journal of Wind Engineering and Industrial Aerodynamics, Vol. 34, pp. 213-221 
    11. Lam, K. Li, J. Y., Chan, K. T. and So, R. M. C., 2003, 'Flow Pattern and Velocity Field Distribution of Cross-Flow around Four Cylinders in a Square Configuration at Low Reynolds Number,' Journal of Fluids and Structures, Vol. 17, pp. 665-579 
    12. Zdravkovich, M. M., 1987, 'The Effects of Interference between Circular Cylinders in Cross flow,' Journal of Fluids and Structures, Vol. 1, pp. 239-261 

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