A CFD analysis of the aerodynamics of a high-speed train passing through a windbreak transition under crosswind

Liu, Tanghong; Chen, Zhengwei; Zhou, Xi-sai; Zhang, Jie

doi:10.1080/19942060.2017.1360211

Cited by 67 publications

(44 citation statements)

References 19 publications

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“…In addition, crosswind assessment has been done on a full-scale train as part of the TRANSAERO (A European Initiative on Transient Aerodynamics for Railway System Optimisation) project (Matschke et al, 2002). Xiong et al (2006) and Liu et al (2018) measured the train surface pressure using a vehicle-mounted pressure test system when high-speed trains running on the Lanzhou-Xinjiang railway were subjected to crosswinds. Although full-scale experiments represent reality, they are difficult to perform and researchers have no control of the atmospheric winds such as yaw angle, wind speed and turbulence intensity (Schetz, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Diedrichs et al (2007) studied the crosswind stability for Inter-City Express (ICE) high-speed train running on an embankment using the standard k-ε and quadratic k-ε turbulence models. Liu et al (2018) used SST to investigate the aerodynamics of a high-speed train passing through a windbreak under crosswind. Diedrichs (2003) investigated the effect of different kε turbulence models and numerical schemes on the crosswind stability of trains.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Reynolds-Averaged Navier-Stokes Modelling of the Flow around a Simplified Train in Crosswinds

Li¹,

Zhang²,

Rashidi³

et al. 2019

JAFM

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Currently, there are different computational fluid dynamic (CFD) techniques used to obtain the flow around trains. One of these techniques is the Reynolds-averaged Navier-Stokes (RANS), which is commonly and widely used by industry to obtain the mean flow field around trains in different operating conditions. In order to assess the performance of RANS turbulence modelling for train aerodynamics, five different common RANS modelling have been used in this paper to obtain the flow and the surface pressure around a simplified train model subjected to crosswind; the standard k- model, the realisable k- model, the Re-Normalisation Group (RNG) k- model, the standard k- model and Shear Stress Transport (SST) k- model. The train model was stationary and subjected to crosswind with a 90 o yaw angle. The effects of mesh size and spatial discretization scheme on the aerodynamic characteristics of the train were also investigated. The results obtained from the different RANS models were compared to those from published experimental data. In general, all the RANS models provided the pressure distribution trend. However, all k- models overestimate the surface pressure on the train body except the bottom face. The standard k- model underestimates the surface pressure on the train body except the streamwise face. It was shown that the simulation using SST k- model together with a second order discretization scheme provides the closest results to the experimental surface pressure. It could be concluded from the present study that the SST k-model with a second order discretization scheme and y+ around 1.0 is the most appropriate RANS model for simulating the flow around trains subjected to crosswinds.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Reynolds-Averaged Navier-Stokes Modelling of the Flow around a Simplified Train in Crosswinds

Li¹,

Zhang²,

Rashidi³

et al. 2019

JAFM

View full text Add to dashboard Cite

show abstract

“…The turbulent structure of the airflow field is complicated in the region where is applied local refinements shown in Figure 3(b). And it is difficult to solve the velocity in this region (Chen et al, 2017(Chen et al, , 2018Guo et al, 2018;Liu, Chen, Zhou, & Zhang, 2017). Therefore, the probe points are selected on the axis of the inlet duct in this region for grid-independent verification.…”

Section: Mesh Discretization and Independence Verificationmentioning

confidence: 99%

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Liu

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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A gravity settling chamber plays an important role in improving the effect of the dust removal when it is selected as a dust collector in a pneumatic cleaning system for cleaning a subway tunnel. The settling rate and the indexes evaluating the secondary blowing are studied to assess the effect of the dust removal in this paper. Regarding the length of the settling chamber, the height of the inlet duct, and the diameter and height of the outlet duct as the variables of the key structures, a flow field simulation analysis of the gravity settling chamber with different heights of the dust accumulation is carried out, then the key structure parameters are optimized by means of the experimental method of uniform design. Finally, the settling chamber with an excellent dust removal effect is obtained. Major conclusions can be drawn as follows. (1) The maximum velocity and the mean velocity ratio of the airflow near a dust accumulation surface are important evaluation indexes for judging the secondary blowing. (2) The maximum velocity near a dust accumulation surface usually doesn't appear on the vertical plane through the axis of the inlet duct or the outlet duct. (3) An excellent settling effect can be ensured during the whole cleaning process only when the maximum design height of the dust-accumulation surface is considered as a key working condition. (4) An excellent settling effect can be realized if the settling chamber without any filtering device and affiliated baffle structure are long enough. (5) The secondary blowing can be avoided if the inlet and outlet of the setting chamber are far away from the dust-accumulation surface. This study has a good guiding significance for the design of gravity settling chamber.

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“…At present, the dynamic mesh and sliding mesh method are usually used to present the movement of the train in the simulation. Based on the dynamic technique, Wang, Xu, Zhu, and Li (2014) explored the crosswind effect on road vehicles passing by bridge tower and Liu, Chen, Zhou, and Zhang (2018) numerically made an aerodynamic analysis about a train traveling through a rectangular windbreak zone by means of the sliding mesh. Nevertheless, significant disadvantages of these methods are that for the very complex and irregular geometry model of the moving part, it is difficult to generate the solving mesh.…”

Section: Introductionmentioning

confidence: 99%

The effect of moving train on the aerodynamic performances of train-bridge system with a crosswind

Yao

Zhang

Chen

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Some aerodynamic results about the effect of moving train on the aerodynamics of train-bridge system in crosswinds are introduced using a computational fluid dynamics (CFD) method. In the simulation, a new overset mesh approach is applied to present the motion of trains, and the results are compared with that of the scaled wind tunnel experiment to validate the accuracy of the mesh and algorithm. Besides, the aerodynamic characteristics associated with the train and bridge are discussed for a range of resultant yaw angles. It is found that the resultant yaw angle is significantly important for the aerodynamic performances of trains, and the aerodynamic interaction on the nose of head-car can affect the flow features around train-bridge system to produce larger aerodynamic loads on the head-car. Furthermore, a new fitting formula for some resultant yaw angles is proposed to predict the aerodynamic forces on trains. Finally, the time-varying forces on the bridge are presented and a sudden change of aerodynamic loads is also observed due to the effect of moving train. The variation magnitude of forces depends on the train speed, and the mean value of forces is only determined by the natural wind velocity.

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A CFD analysis of the aerodynamics of a high-speed train passing through a windbreak transition under crosswind

Cited by 67 publications

References 19 publications

On the Reynolds-Averaged Navier-Stokes Modelling of the Flow around a Simplified Train in Crosswinds

On the Reynolds-Averaged Navier-Stokes Modelling of the Flow around a Simplified Train in Crosswinds

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

The effect of moving train on the aerodynamic performances of train-bridge system with a crosswind

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