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| CFD Detached-eddy Numerical Simulation of High Speed Train Intersecting in Tunnel |
| Received:January 30, 2019 Revised:February 20, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.11.001 |
| KeyWord:intersect in tunnel pressure wave detached eddy simulation spectrum analysis fourier transform |
| Author | Institution |
| ZHANG De-wen |
School of Mechanical Engineering Chengdu , China |
| LU Yao-hui |
School of Mechanical Engineering Chengdu , China ;Graduate school of Tangshan, Southwest Jiaotong University, Tangshan , China |
| LI Wang |
School of Mechanical Engineering Chengdu , China |
| BI Wei |
School of Mechanical Engineering Chengdu , China ;Engineering Research Center of Advanced Driving Energy-saving Technology, Ministry of Education, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Objective To study the pressure fluctuation and wake flow characteristics of high-speed train tunnels intersecting in tunnel. Methods A three-car model of a high-speed train was established and the flow field of two trains intersecting in a tunnel at 350 km/h was simulated by the detached eddy method. The spatial discretization pressure term, density term and the modified turbulent viscosity term were simulated by the second-order upwind; the momentum term was simulated by the bounded central difference, the time discretization was simulated by the second-order precision difference; and the tunnel wall was treated with a wall function and Reynolds time-averaged method was also used for comparison. The pressure time history of the front, side wall and tail of the train was calculated. Then the spectrum of the measured points of the tail car was analyzed by Fourier transform. Finally, the turbulence intensity at different positions in the tail flow was analyzed. Results The pressure fluctuation of the front car was the most violent, that of the middle car was the second, and that of the rear car was the smallest. The pressure variation of the side wall of the train at the same vertical position and at different heights was not significant. The main frequency of wake vortex was around 3.85 Hz, which may have some influence on the lateral vibration of train. Conclusion The wake vortices are two moderately strong vortices which develop backward continuously. In the fully developed stage, the turbulence intensity will increase obviously and then decrease gradually. Because of the rapid development of the lateral eddy current, the strength of eddy in meeting-side is small and its weakening speed is fast. |
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