Unsteady aerodynamic loads on high speed trains passing by each other

Hwang, Jae Ho; Lee, Dong Hoon

doi:10.1007/bf03184475

Cited by 8 publications

(3 citation statements)

References 11 publications

(5 reference statements)

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“…For example, the magnitude and rate of change of the pressure pulse, side force, and overturning moment increase dramatically. Therefore, to ensure the safety of two trains passing each other, full-scale tests [4,5], moving model tests [6][7][8], and computational fluid dynamics (CFD) simulations [2,3,9] have been performed to investigate the aerodynamic performance of the trains. It was found that parameters including the train speed, line spacing, nose shape, and marshalling length affect the aerodynamic performance of the passing trains.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Unsteady Aerodynamic Performance of Two Maglev Trains Passing Each Other in Open Air Using Different Turbulence Models

Krajnović

Zhou

2021

Applied Sciences

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The strong change in the flow fields around two maglev trains (MTs) passing each other in open air may affect their manoeuvrability and passengers’ comfort. In this study, we evaluated the aerodynamic performance of two MTs passing each other via shear stress transport (SST) k–ω model and improved delayed detached eddy simulations based on the Spalart–Allmaras model (SA−IDDES) and the SST k–ω model (SST−IDDES). The accuracy of the numerical simulation method was verified using experimental data acquired from a moving model test. The results showed that the difference in the amplitude of the transient pressure obtained with the different turbulence models was less than 5%. The wake vortex structures on the intersection side were found to interact, and their intensity consequently decreased. The SST−IDDES model produced smaller-scale vortices than the SA−IDDES model, particularly in the near-wake region. There were large differences in the drag and lift forces obtained using the different turbulence models. Among them, the lift force of the tail car was more sensitive to the turbulence model, and its maximum value obtained with the SST−IDDES model was 11% larger than that obtained with the SA−IDDES model.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Unsteady Aerodynamic Performance of Two Maglev Trains Passing Each Other in Open Air Using Different Turbulence Models

Krajnović

Zhou

2021

Applied Sciences

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“…The propagation and characteristics of the air wave in a railway tunnel caused by the passage of a train or passing trains have increasingly aroused great academic and engineering concerns in rail transport. [1][2][3][4][5] With the increased speed of trains, the magnitude of the initial pressure rise generated around the car body becomes much larger than that in the open sections; this unsteady aerodynamic loading may destabilize the trains (i.e. the car body is in a state of sway and yawing motion), and thus cause larger running vibrations.…”

Section: Introductionmentioning

confidence: 99%

The characteristics of air wave induced by two high-speed trains passing by each other in a tunnel

Liu

Jing

Ren

2018

Advances in Mechanical Engineering

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A three-dimensional computational model of two CRH2 trains passing by each other in a tunnel was developed using finite volume method with moving mesh, to investigate the characteristics of air wave and flow field around high-speed trains. Two meeting scenarios (i.e. meeting at the same train speeds and at different train speeds) and five train speeds (i.e. 200, 250, 300, 350, and 400 km/h) were examined. The computational model is demonstrated to be qualified to investigate the characteristics of air wave for two trains meeting in a tunnel. The pressure distribution and velocity vectors of two trains meeting in a tunnel were revealed, and the typical features of the corresponding air wave curve were discussed. Furthermore, the variation regularity of pressure amplitudes and the relationship between pressure wave amplitude and train speed were also analyzed. The results indicate that two trains with a large speed difference should be avoided when they pass by each other in a tunnel. These findings are helpful to guide the design of trains and tunnel structures and the dispatching management of rail transit.

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“…Numerical simulations of the strain passing by on the double-track were carried out to study the effect of the train nose-shape, length and the existence of a tunnel on the crossing event. [2]. RA MacNeill et al described a set of experiments designed to gather pressure-time histories on a tall, large surface area double-stack container car as a high-speed train passes [3] .…”

Section: Introductionmentioning

confidence: 99%

Analysis on Aerodynamic Effect of Common Passenger Train and EMU Passing by Each Other under Crosswind

Song¹,

Cao²,

Lai³

2017

dtetr

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The three-dimensional unsteady N-S equation and the k-ε equation turbulence model were made to solve the aerodynamic performance of common passenger train passing by Electric Multiple Units (EMU) under crosswind based on the finite volume method and sliding mesh method. The results of full-scale train experimental method and numerical simulation method were compared. The results of numerical simulation show that when common passenger train and EMU pass by each other under crosswind, crosswind has great effect on the aerodynamic performance of trains. When there is no crosswind, the lateral force of the locomotive of common passenger train and the first car of EMU are the largest, 11.55 kN and 6.25 kN respectively. When there is crosswind and the wind speed reaches 40 m/s, the overturning moment of common passenger train and EMU are 87.9 kN·m and 239.9 kN·m, which means when trains pass by each other under strong wind, there are great security risks. When wind-break walls are set in line side, lateral forces of trains are significantly decreased.

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Unsteady aerodynamic loads on high speed trains passing by each other

Cited by 8 publications

References 11 publications

Numerical Study of the Unsteady Aerodynamic Performance of Two Maglev Trains Passing Each Other in Open Air Using Different Turbulence Models

Numerical Study of the Unsteady Aerodynamic Performance of Two Maglev Trains Passing Each Other in Open Air Using Different Turbulence Models

The characteristics of air wave induced by two high-speed trains passing by each other in a tunnel

Analysis on Aerodynamic Effect of Common Passenger Train and EMU Passing by Each Other under Crosswind

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