Title: A new calculation method for micro-pressure waves induced by high-speed train passing through long tunnels and bend tunnels

Authors: Mingzhi Yang; Hongqi Tian; Xianxu Yuan; Dan Zhou; Yanfei Li; Zhiwei Li

Addresses: Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China ' Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China ' Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China; China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, China ' Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China ' Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China ' Key Laboratory for Traffic Safety on Track, Ministry of Education, Central South University, Shaoshan Road 22, Changsha City, Hunan Province 410075, China

Abstract: In this paper, a new calculation method using the overlapping grid is proposed on the basis of the physical generation mechanism of micro-pressure waves which can be used efficiently in long tunnels and firstly in bend tunnels for the calculation of micro pressure waves. The method can be divided into two steps: a) a dynamic reconfiguration grid algorithm is adopted at the entrance domain with the train model in to calculate the compression waves generated inside the tunnels; b) a stationary grid algorithm is utilised at the exit domain and other domains of the tunnel without the train model to calculate the compression wave propagation and micro-pressure wave generation. The results show good agreements with the full-scale and moving model measurements with differences less than 7%, which verifies that the new domain decomposition method can simulate the micro pressure wave peaks accurately but less costly.

Keywords: high speed trains; long tunnels; micro-pressure waves; computational fluid dynamics; CFD; pressure waves; tunnel bends; overlapping grid; modelling; compression wave propagation; domain decomposition.

DOI: 10.1504/PCFD.2015.072011

Progress in Computational Fluid Dynamics, An International Journal, 2015 Vol.15 No.5, pp.269 - 278

Published online: 29 Sep 2015 *

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