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PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Development of a Numerical Modelling of Snow Accumulation on a High Speed Train
N. Paradot1, E. Allain2, R. Croué2, X. De La Casa3 and J. Pauline3
1Rolling Stock Department, SNCF, Paris, France
N. Paradot, E. Allain, R. Croué, X. De La Casa, J. Pauline, "Development of a Numerical Modelling of Snow Accumulation on a High Speed Train", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 34, 2014. doi:10.4203/ccp.104.34
Keywords: snow accumulation, aerodynamics, climatic wind tunnel, computational fluid dynamics, high speed train, TGV.
The French National Railway Company (SNCF) has led investigations on snow accretion phenomenon to reduce snow accumulations on a train's undercarriage. Wind tunnel experiments have been conducted to collect data on snow behaviour around a half scale railway mock-up and various prism shapes. The analysis of experimental results on prisms allowed the construction of a probability law for particle trapping on walls, in respect of the impact angle. The development of an Euler-Lagrange numerical method, combined with adapted mathematical laws (fitted with experimental results), led to a large calculation taking into account a whole TGV Duplex trainset at normal cruising speed. A methodology has been developed to make it possible using particle seeding by suspension from the ground and domain division processes for the fluid flow and particle trajectories. The method was then used to perform parametric studies and a mesh morphing tool was set to allow volume description of snow accretion.
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