Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Unsteady Aerodynamic Loads on High Speed Trains Passing by Each Other

  • Hwang, Jae-Ho (Department of Aerospace Engineering, Institute of Advanced Machinery Design, Seoul National University) ;
  • Lee, Dong-Ho (School of Mechanical and Aerospace Engineering, Seoul National University)
  • Published : 2000.08.01
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Abstract

In order to study unsteady aerodynamic loads on high speed trains passing by each other 350km/h, three-dimensional flow fields around trains during the crossing event are numerically simulated using three-dimensional Euler equations. Roe's FDS with MUSCL interpolation is employed to simulate wave phenomena. An efficient moving grid system based on domain decomposition techniques is developed to analyze the unsteady flow field induced by the restricted motion of a train on a rail. Numerical simulations of the trains passing by on the double-track are carried out to study the effect of the train nose-shape, length and the existence of a tunnel on the crossing event. Unsteady aerodynamic loads-a side force and a drag force-acting on the train during the crossing are numerically predicted and analyzed. The side force mainly depends on the nose-shape, and the drag force depends on tunnel existence. Also. a push-pull (i.e.impluse force) force successively acts on each car and acts in different directions between the neighborhood cars. The maximum change of the impulsive force reaches about 3 tons. These aerodynamic force data are absolutely necessary to evaluate the stability of high speed multi-car trains. The results also indicate the effectiveness of the present numerical method for simulating the unsteady flow fields induced by bodies in relative motion.

Keywords

References

  1. Fujii, K., 1992, 'Unified Zonal Method Based on the Fortified Solution Algorithm,' ISAS Report No. 648
  2. Fujii, K. and Ogawa, T. 1995, 'Aerodynamics of High Speed Trains Passing by Each Other,' Computers & Fluids, Vol. 24, No. 8, pp. 897-908 https://doi.org/10.1016/0045-7930(95)00024-7
  3. Holmes, B. S., Dias, J., Rifai, S. M., Buell, J. C., Zohan, Z., Sassa, T. and Sato, T., 1999, 'Solution of Train-Tunnel Entry Flow Using Parallel Computing,' Computational Mechanics 23, pp. 24-129 https://doi.org/10.1007/s004660050392
  4. Hwang, J. arid Lee, D, 1998, 'Development of Moving Grid Technique for Unsteady Analysis of High Speed Train,' Proceedings of the KSME 1998 Spring Annual Meeting B, pp. 607-610
  5. Hwang, J. and Lee, D, 1999, 'Numerical Simulation of Flow field around High Speed Trains Passing by Each Other,' AIAA Paper 99-3156
  6. Jameson, A., and Yoon, S., 1987, 'Lower Upper Implicit Schemes with Multiple Grids for the Euler Equations,' AIAA Journal, Vol. 25, pp. 929-935
  7. Kim, H., 1997, 'Aerodynamic Analysis of a Train Running in a Tunnel(II)-Aerodynamics of Two-Trains,' Transaction. of KSME, pp. 983-995, No. 8, 21. 36
  8. Kwon, H., Lee, D., Lee. S., Kim. D. and Kang. S., 1998, 'An Experimental Study on Propagation of Pressure Waves inside the Tunnel and Booming Noise by a High-Speed Train,' Proceedings of the KSME 1998 Fall Annual Meeting B, pp. 735-740
  9. Maeda, T. 1993, 'Effect of Shape of Train Nose on Compression Wave Generated by Train Entering Tunnel,' Proceedings of the International Conference on Speedup Technology for Railway and Maglev Vehicles, PS3-8, pp. 315-319
  10. Mestreau, E., Lohner, R. and Aita, S., 1993, 'TGV Tunnel Entry Simulations Using a Finite Element Code with Autometic Remeshing,' AIAA 93-0890
  11. Ogawa, T. and Fujii, K., 1994, 'Numerical Simulation of Compressible Flows Induced by a Train Moving into a Tunnel,' Computational Fluid Dynamics Journal, Vol. 3, No. 1
  12. Ogawa T. and Fujii, K., 1997, 'Numerical Investigation of Three Dimensional Compressible Flows Induced by a Train Moving Into a Tunnel,' Computers & Fluids, Vol. 26, No. 6., pp. 565-585 https://doi.org/10.1016/S0045-7930(97)00008-X
  13. Peters, J. L., 1983, 'Aerodynamics of Very High Speed Trains and Maglev Vehicles: State of the are and Future Potential,' Int. J. of Vehicle Design, Technological Advances in Vehicle Design Series, SP3, Impact of Aerodynamics on Vehicle Design, pp. 308-341
  14. Rai, M. M. and Hessenius, K., 1986, 'Three Dimensional Conservative Euler Computations Using Patched Grid System and Explicit Methods,' AIAA-86-1081
  15. Roe, P. L. (1981). 'Approximate Riemann Solvers, parameter vectors, and difference schemes,' Journal of Computational Physics, Vol. 43, pp.357-372 https://doi.org/10.1016/0021-9991(81)90128-5
  16. Shimbo, Y., Hosaka, S., 1993, 'Steady and Unsteady Pressure Measurement on High Speed Train,' Proceedings of the International Conference on Speedup Technology for Railway and Maglev Vehicles, PS3-14, pp. 341-346
  17. Steger, J. L., Dougherty, F. C. and Benek, J. A., 1983, 'A Chimera Grid Scheme,' Advances in Grid Generation, FED Vol. 5, ASME, edited by Ghia, K. N., New York, pp. 59-69