Effect of Computational Grid on Uncertainty in Train Aerodynamics

LI Tian; QIN Deng; AN Chao; ZHANG Jiye

doi:10.3969/j.issn.0258-2724.20180503

Volume 54 Issue 4

Jul. 2019

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Journal of Southwest Jiaotong University > 2019 > 54(4): 816-822.

LI Tian, QIN Deng, AN Chao, ZHANG Jiye. Effect of Computational Grid on Uncertainty in Train Aerodynamics[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 816-822. doi: 10.3969/j.issn.0258-2724.20180503

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LI Tian, QIN Deng, AN Chao, ZHANG Jiye. Effect of Computational Grid on Uncertainty in Train Aerodynamics[J]. Journal of Southwest Jiaotong University, 2019, 54(4): 816-822. doi: 10.3969/j.issn.0258-2724.20180503

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Effect of Computational Grid on Uncertainty in Train Aerodynamics

doi: 10.3969/j.issn.0258-2724.20180503

Received Date: 16 Jul 2018
Rev Recd Date: 31 Aug 2018

Available Online: 20 Sep 2018

Publish Date: 01 Aug 2019

Abstract

Abstract

To evaluate the effect of computational grid on the numerical simulation results of train aerodynamics in open air, the uncertainty of the computational grid on train aerodynamic characteristics is studied based on computational fluid dynamics. First, according to the grids of three sizes and the corresponding calculation results, the calculation method for the uncertainty of the train aerodynamic forces and surface pressure is proposed. Second, the ICE2 (inter-city express) train is taken as an object, three different grids are generated, and the pressure on typical cross-sections and aerodynamic forces are obtained by numerical simulation. Finally, the uncertainty of the aerodynamic forces and pressure on typical cross-sections of this train is studied. The results show that the error in aerodynamic side force coefficient between the numerical simulation and experiment is only 0.31%; the uncertainty of the surface pressure on the windward side of vehicle body is close to 0. The position with a higher uncertainty of the surface pressure is mainly located at the bottom of car body, and its maximum uncertainty is 1.42. As for the head car, the uncertainty of the side force coefficient is 0.002 6, and the uncertainty of the lift force coefficient is 0.509 3.
- train aerodynamics,
- uncertainty analysis,
- mesh,
- numerical simulation,
- aerodynamic forces

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Effect of Computational Grid on Uncertainty in Train Aerodynamics

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