Impact of ground and wheel boundary conditions on numerical simulation of the high-speed train aerodynamic performance

Zhang, Jie; Li, Jing-juan; Tian, Huixin; Gao, Guangjun; Sheridan, John

doi:10.1016/j.jfluidstructs.2015.10.006

Cited by 123 publications

(76 citation statements)

References 16 publications

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“…The averaged y+ was about 10. Zhang et al (2016) studied the impact of the ground effect on train aerodynamics with 16 million cells using a DES based on the realizable κ-turbulence model. They also obtained good results.…”

Section: Grid Generationmentioning

confidence: 99%

“…The train aerodynamic coefficients are in a state of fluctuation over time. Based on the literature (Hemida & Krajnović, 2008;Zhang et al, 2016), the non-dimensional time 't* = tU m /H' was used to process the unsteady quantities, and the size of the time step in non-dimensional time units t* = tU m /H = 0.01297. The lateral force on the train for C3 is shown in Figure 6.…”

Section: Mean Quantities and Vortex Visualization Techniquementioning

confidence: 99%

“…The drag, lateral force, and other quantities are then calculated by taking the average value over the non-dimensional time t* from 90 (t = 0.70 s) to 272 (t = 2.1 s), which is sufficient for calculating the mean quantities (Hemida & Baker, 2010;Hemida & Krajnović, 2010;Östh & Krajnović, 2014). The iso-surface of the constant Q is used to describe the transient vortex structure and has been widely used in describing the flow structure around a train (Flynn, Hemida, Soper, & Baker, 2014;Zhang et al, 2016). The value of Q is given by the following:…”

Section: Mean Quantities and Vortex Visualization Techniquementioning

confidence: 99%

“…The flow around a high-speed train is in a highly unsteady state, and vortex shedding from the train often occurs (Zhang, Li, Tian, Gao, & Sheridan, 2016). This phenomenon is especially significant under a crosswind (Hemida, Krajnovic, & Davidson, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

Niu

Zhou

Liang

2017

Engineering Applications of Computational Fluid Mechanics

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The focus of this study was the influence of the length of a train on its aerodynamic performance, with and without wind break walls, under a crosswind. The improvement in the train's aerodynamic performance due to a wind break wall was also analyzed. Aerodynamic coefficients such as the drag force and lateral force were obtained for trains of different lengths using a numerical simulation. A delayed detached eddy simulation based on the shear-stress transport κ-ω turbulent model was used in Fluent 14.0 to simulate the unsteady aerodynamic performances of trains of different lengths under a crosswind. Through a comparison and analysis of the simulation results, the effects of the train length on the forces, pressure, and flow structure around the train were studied, along with the influence of a wind break wall on trains of different lengths. The results showed that the effects on the forces, pressure, and flow structure were focused in the region around the train tail. Furthermore, it was found that a wind break wall could improve the aerodynamic characteristics of a train under a crosswind, but amplified the influence of the train length on the aerodynamic performance of the train tail. These research results provide useful guidance for train operations under a crosswind. ARTICLE HISTORY

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Section: Grid Generationmentioning

confidence: 99%

Section: Mean Quantities and Vortex Visualization Techniquementioning

confidence: 99%

Section: Mean Quantities and Vortex Visualization Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

Niu

Zhou

Liang

2017

Engineering Applications of Computational Fluid Mechanics

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“…of snow particles can be obtained by integrating the differential equations that describe the forces acting on the snow particles. The differential equation describing the forces acting on the snow particles can be consult in reference [17][18][19][20] .…”

Section: Mathematical Model and Geometry Modelmentioning

confidence: 99%

Numerical Simulation of Snow Accumulation on a Bogie of a High-Speed Train

Wang¹,

Gao²,

Zhang³

et al. 2017

dtetr

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The operation of high-speed trains in ice and snow weather results in a large amount of snow accumulation with ice on bogie, which will seriously damage the safety of high-speed trains. In this paper, the snow accumulation on the bogie has been investigated using numerical simulation method based on Realizable  k  turbulence model. The accuracy of mesh resolution and methodology of CFD were validated by combining with the experimental results of wind tunnel tests. The Discrete Phase Model (DPM) was used to investigate the process of snow accumulation on bogie. The results show that the high-concentration snow particles mainly flow under the bogie, and the heat-producing equipment is in high snow concentration while the top surfaces of bogie are in low one; when high-speed trains running in one way, the snow on the front motor and gear cover is more than the rear, while the snow accumulation on the rear brake calipers is more than the front, the accumulation quality of snow on the motors is far more than on brake calipers and gear covers.

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