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Z. Liu, D. Soper, H. Hemida, "Effect of separation bubbles around the head of a freight train on pressure waves inside tunnels using 1d and 3d numerical methods", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.6, 2022, doi:10.4203/ccc.1.18.6

Keywords: freight train, tunnel, train aerodynamics, pressure wave.

Abstract

The bluff nature of freight train will influence the pressure wave pattern generated by it passing through a tunnel. This paper aims to investigate the effect of separation bubble induced by the blunted head of a freight train on pressure waves, and model it into a redeveloped 1-d code. Firstly 3d simulations have been done to and assess the capability of RANS to predict the development of the separation bubble. The results shows that SST k-? RANS gives a reasonable predication of the shape and height the of separation bubble. Then this model is adopted to conduct a simulation of a freight train enter into a tunnel, from which the result is used as the input of the 1d code. Besides, the 1-d code is redeveloped to consider the effect of gradual cross-sectional area change of the train body. The result shows that the traditional 1d code failed to predict the maximum initial pressure rise caused by the separation bubble. After modification, this issue is greatly improved.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 18.6 Effect of separation bubbles around the head of a freight train on pressure waves inside tunnels using 1d and 3d numerical methods Z. Liu, D. Soper and H. Hemida School of Civil Engineering, University of Birmingham, Birmingham, United Kingdom doi:10.4203/ccc.1.18.6 Full Bibliographic Reference for this paper Z. Liu, D. Soper, H. Hemida, "Effect of separation bubbles around the head of a freight train on pressure waves inside tunnels using 1d and 3d numerical methods", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.6, 2022, doi:10.4203/ccc.1.18.6 Keywords: freight train, tunnel, train aerodynamics, pressure wave. Abstract The bluff nature of freight train will influence the pressure wave pattern generated by it passing through a tunnel. This paper aims to investigate the effect of separation bubble induced by the blunted head of a freight train on pressure waves, and model it into a redeveloped 1-d code. Firstly 3d simulations have been done to and assess the capability of RANS to predict the development of the separation bubble. The results shows that SST k-? RANS gives a reasonable predication of the shape and height the of separation bubble. Then this model is adopted to conduct a simulation of a freight train enter into a tunnel, from which the result is used as the input of the 1d code. Besides, the 1-d code is redeveloped to consider the effect of gradual cross-sectional area change of the train body. The result shows that the traditional 1d code failed to predict the maximum initial pressure rise caused by the separation bubble. After modification, this issue is greatly improved. download the full-text of this paper (PDF, 6 pages, 533 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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