Development of a Numerical Modelling of Snow Accumulation on a High Speed Train

2014 ◽  
Author(s):  
N. Paradot ◽  
E. Allain ◽  
R. Croué ◽  
X. De La Casa ◽  
J. Pauline
Keyword(s):  
Numerical Modelling ◽  
High Speed ◽  
Snow Accumulation ◽  
High Speed Train

A numerical investigation on the improvement of anti-snow performance of the bogies of a high-speed train

2019 ◽  
Vol 234 (10) ◽  
pp. 1319-1334 ◽  
Author(s):  
Jiabin Wang ◽  
Yan Zhang ◽  
Jie Zhang ◽  
Xifeng Liang ◽  
Sinisa Krajnović ◽  
...  
Keyword(s):  
Pressure Distribution ◽  
High Speed ◽  
Weather Conditions ◽  
Snow Accumulation ◽  
Navier Stokes ◽  
High Speed Train ◽  
Discrete Phase Model ◽  
Flow Features ◽  
High Speed Trains ◽  
Discrete Phase

In this paper, numerical simulations combining unsteady Reynolds-averaged Navier-Stokes (URANS) simulation and the discrete phase model are used to study the application of countermeasure for snow accumulation in the regions of bogie cavities of a high-speed train. The influence of the cowcatcher heights and guide structure configurations on the flow features and snow accumulation was studied. The results of the study show that the cowcatcher with a downward elongation of 4% of the distance between the two axles decreases the snow accumulation in the first and the second bogie regions by about 56.6% and 13.6%, respectively. Furthermore, the guide structures have been found to significantly alter the velocity and pressure distribution in the second bogie region, resulting in a relatively large snow-accumulation reduction. The deflector is found to perform better in reducing snow accumulation when compared to the diversion slots. The cowcatcher, elongated in the downward direction, and the deflector proved to be a good countermeasure for snow accumulation around the bogies of high-speed trains operating in snowy weather conditions.

Anti-snow performance of snow shields designed for brake calipers of a high-speed train

2018 ◽  
Vol 233 (2) ◽  
pp. 121-140 ◽  
Author(s):  
Jiabin Wang ◽  
Guangjun Gao ◽  
Yan Zhang ◽  
Kan He ◽  
Jie Zhang
Keyword(s):  
High Speed ◽  
Snow Accumulation ◽  
Cold Weather ◽  
High Speed Train ◽  
Detached Eddy Simulation ◽  
Discrete Phase Model ◽  
Railway Line ◽  
Eddy Simulation ◽  
Flow Features ◽  
Discrete Phase

When high-speed trains run on a snowy railway line in cold weather, a large amount of snow and ice will accumulate on the brake calipers, which can lead to huge safety problems. In this paper, to solve this issue, a numerical method based on the detached eddy simulation was used to explore the flow features of a high-speed train running in cold weather. The accuracy of mesh resolution and methodology of Computational Fluid Dynamics (CFD) was validated against the wind tunnel tests. A discrete phase model was used to investigate the process of snow accumulation on the brake calipers by analysing the movement characteristics of snow particles. Based on this analysis, three kinds of anti-snow packing shields for the brake calipers were designed, and the shielding effects were compared via numerical simulations. The results show that a large amount of snow particles below the bogie directly impact the brake calipers causing massive snow packing on the bottom surfaces; some snow particles reflected from the rear equipment cabin cover return to the bogie region and accumulates on the upper surfaces. With the application of anti-snow packing shields with trapezoidal-, triangular- and cambered-shaped openings, the rates of snow accumulation on the brake calipers were reduced by 18.53, 26.68 and 38.81%, respectively. The cambered type provides the best anti-snow packing performance for the brake calipers.

Numerical modelling of vibrations from a Thalys high speed train in the Groene Hart tunnel

2010 ◽  
Vol 30 (3) ◽  
pp. 82-97 ◽  
Author(s):  
S. Gupta ◽  
H. Van den Berghe ◽  
G. Lombaert ◽  
G. Degrande
Keyword(s):  
Numerical Modelling ◽  
High Speed ◽  
High Speed Train

Numerical study on the anti-snow performance of deflectors in the bogie region of a high-speed train using the discrete phase model

2018 ◽  
Vol 233 (2) ◽  
pp. 141-159 ◽  
Author(s):  
Guangjun Gao ◽  
Yan Zhang ◽  
Fei Xie ◽  
Jie Zhang ◽  
Kan He ◽  
...  
Keyword(s):  
High Speed ◽  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Snow Accumulation ◽  
Phase Model ◽  
High Speed Train ◽  
Discrete Phase Model ◽  
Discrete Phase ◽  
Deflector Plate

In this paper, the three-dimensional unsteady Reynolds-averaged Navier-Stokes equations with an RNG double-equation turbulence model and a discrete phase model were used for the investigation of snow accumulation on the bogie of a high-speed train. Two kinds of deflector plates, one installed at the front end and the other at the rear end of the bogie, were proposed to reduce snow accumulation. The accuracy of the CFD methodology was validated against wind tunnel tests. The results showed that high-speed air will impact the plates where snow particles get accumulated. The snow covering on the bogie rarely drifts back into the bogie region with air. The amount of accumulating snow in the optimum models is reduced by 50.58% on average as compared to those in the original models. At the rear end of the bogie, the inclined deflector plate reduced snow accumulation by up to 10.91% compared to the vertical deflector plate.

scholarly journals Effect of Snow Parameters on Snow Accumulation in High-speed Train Bogies

2020 ◽  
Vol 56 (10) ◽  
pp. 216
Author(s):  
ZHANG Le ◽  
LI Tian ◽  
CAI Lu ◽  
ZHANG Jiye ◽  
AN Chao
Keyword(s):  
High Speed ◽  
Snow Accumulation ◽  
High Speed Train

scholarly journals Numerical modelling for a simplified bridge pier model under high-speed train passage over the bridge

2021 ◽  
Vol 660 (1) ◽  
pp. 012143
Author(s):  
Zhiyang Wang ◽  
Chaopu Chen ◽  
Youming Li ◽  
Hong Liu ◽  
Wenlei Bai
Keyword(s):  
Numerical Modelling ◽  
High Speed ◽  
Bridge Pier ◽  
High Speed Train
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