Tanghong Liu
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View article: Prediction of train aerodynamic coefficients under diverse shape parameters and yaw angles
Prediction of train aerodynamic coefficients under diverse shape parameters and yaw angles Open
Acquiring aerodynamic coefficients of a high-speed train considering its shape parameters and environmental yaw angles typically requires resource-intensive model tests or numerical simulations. To address this issue, this paper proposes a…
View article: An external design for performance improvement of the transition windbreak wall between an embankment and a hill cut on a high-speed railway
An external design for performance improvement of the transition windbreak wall between an embankment and a hill cut on a high-speed railway Open
The embankment and the hill cut are conventional infrastructure scenarios along the railway line in windy regions. The windbreak walls with the same height are separately installed on them to guarantee the safety of train operation. Howeve…
View article: Study on the influence of asymmetric mountain structures at tunnel portals on the aerodynamics of intersecting trains
Study on the influence of asymmetric mountain structures at tunnel portals on the aerodynamics of intersecting trains Open
When two trains going through a tunnel pass each other, the difference of the surrounding space between a train's both sides rises, which induces abrupt aerodynamic force variations on the trains, resulting in the phenomenon of sudden sway…
View article: Manipulation of the flow induced by afterbody vortices using sweeping jets
Manipulation of the flow induced by afterbody vortices using sweeping jets Open
In this study, the impact of oscillatory fluids on the flow induced by afterbody vortices, resembling those of a high-speed train, was investigated in wind tunnel experiments. The afterbody vortices were generated by a cylindrical model wi…
View article: On the Turbulence Models for Numerically Predicting Vehicle-Like Afterbody Vortex Flows
On the Turbulence Models for Numerically Predicting Vehicle-Like Afterbody Vortex Flows Open
View article: On the anti-rolling performance of a train using a vortex generator array
On the anti-rolling performance of a train using a vortex generator array Open
Vortex generators (VGs) have shown the potential to mitigate the train's operational instability issues caused by strong wind. Numerical simulations are used to predict the flow structures around a train with VGs of different heights. The …
View article: Numerical study on the effect of pantograph fairing on aerodynamic performance at various train heights
Numerical study on the effect of pantograph fairing on aerodynamic performance at various train heights Open
The pantograph is one of the primary sources of aerodynamic drag and noise during the operation of a high-speed train. To investigate the impact of the pantograph fairing on the aerodynamic performance at various train heights, six computa…
View article: A suction method to mitigate pressure waves induced by high-speed maglev trains passing through tunnels
A suction method to mitigate pressure waves induced by high-speed maglev trains passing through tunnels Open
When a high-speed maglev train travels through a tunnel, sudden pressure changes are generated in the tunnel, which have a negative impact on the comfort of passengers and the service life of equipment. Moreover, a strong micro-pressure wa…
View article: Reducing the aerodynamic drag of high-speed trains by air blowing from the nose part: Effect of blowing speed
Reducing the aerodynamic drag of high-speed trains by air blowing from the nose part: Effect of blowing speed Open
View article: Computational fluid dynamics prediction of the aerodynamic difference between stationary and moving trains
Computational fluid dynamics prediction of the aerodynamic difference between stationary and moving trains Open
View article: Application of periodic boundaries in freight train aerodynamic performance simulations
Application of periodic boundaries in freight train aerodynamic performance simulations Open
The length of long marshalling freight train and the non-streamline shape of wagon lead to more difficulties in simulating the aerodynamic performances. To simplify the simulation process of long freight trains and conserve computational r…
View article: Impact of the windbreak transition on flow structures of the high-speed railway and mitigation using oblique structure and circular curve structure transition
Impact of the windbreak transition on flow structures of the high-speed railway and mitigation using oblique structure and circular curve structure transition Open
Purpose This paper aims to investigate the variations in the flow fields induced by transition regions in the windbreak structures between the flat ground and the cutting along a railway and to propose mitigation measures to improve the wi…
View article: Influence of the Downstream Vehicle Length on Train Aerodynamics Subjected to Crosswind
Influence of the Downstream Vehicle Length on Train Aerodynamics Subjected to Crosswind Open
Limited by the wind tunnel size, a short-length train model is generally adopted during the test to represent the realistic long tandem. Thus, the reasonable arrangement of the trailing vehicle is of significance for experimental accuracy.
View article: Impact of ballast length on train aerodynamics for a wind tunnel layout via CFD analysis
Impact of ballast length on train aerodynamics for a wind tunnel layout via CFD analysis Open
Ground configurations are an essential part of rail vehicles during wind tunnel tests. Reasonable reproductions of the infrastructures are of significance for experimental accuracy. In this work, the effects of ballast length were numerica…
View article: Waterproof, Anti‐Impacted, and Ultrathin Carbon‐Based Air Pressure Sensors Toward Aerodynamic Tests on High‐Speed Trains
Waterproof, Anti‐Impacted, and Ultrathin Carbon‐Based Air Pressure Sensors Toward Aerodynamic Tests on High‐Speed Trains Open
A flexible ultrathin air pressure sensor is developed by Zhiming Chen, Jianyi Luo, and co-workers, article number 2101781. This sensor is based on a sense materials of carbon fiber beams and a sealed microchamber structure, which allows th…
View article: Aerodynamic characteristics of double-connected train groups composed of different kinds of high-speed trains under crosswinds: A comparison study
Aerodynamic characteristics of double-connected train groups composed of different kinds of high-speed trains under crosswinds: A comparison study Open
As train speeds continuously increase, the crosswind stability of high-speed trains (HSTs) has been a prominent research topic. Benefiting from advances in railway technology, the coupled operation of different HSTs has been proven to be p…
View article: Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway
Unsteady Aerodynamic Characteristics of a High-Speed Train Induced by the Sudden Change of Windbreak Wall Structure: A Case Study of the Xinjiang Railway Open
Under strong winds, the effect of sudden windbreak transition (WT) on high-speed trains is severe, leading to a deterioration of train aerodynamics and sudden yawing motion of the car body. To address these problems, based on a high-speed …
View article: Research progress on train operation safety in Xinjiang railway under wind environment
Research progress on train operation safety in Xinjiang railway under wind environment Open
Railway lines in the Xinjiang wind area face severe wind disasters year-round, which seriously affects the safety and economy of the railway in China. Therefore, the wind characteristics and statistics of wind-induced accidents along the X…
View article: Mitigating crosswind effect on high-speed trains by active blowing method: a comparative study
Mitigating crosswind effect on high-speed trains by active blowing method: a comparative study Open
To reduce the crosswind effect on high-speed trains, in this paper, by using the Improved Delayed Detached Eddy Simulation (IDDES) method and the SST [Formula: see text] turbulence model, a novel blowing measure is studied and compared by …
View article: Influence of height of earth embankment type windbreak wall on flow field characteristics and catenary wind-induced displacement
Influence of height of earth embankment type windbreak wall on flow field characteristics and catenary wind-induced displacement Open
This paper aims at ensuring the safety of catenary operation, by considering the flow field characteristics of the specific railway terrain and the wind-induced dispalcement of the catanery contact wires. Combining fluid and structure anal…
View article: Numerical simulation of the aerodynamic characteristics of double unit train
Numerical simulation of the aerodynamic characteristics of double unit train Open
Double unit trains running at high speeds may create additional aerodynamic challenges due to two streamlined structures with close proximity, exploring the aerodynamic performance of double unit trains is now critical. In this study, deta…
View article: Numerical Analysis of Different Nose Shapes on the Train Aerodynamic Performance at a Windbreak Transition under Crosswinds
Numerical Analysis of Different Nose Shapes on the Train Aerodynamic Performance at a Windbreak Transition under Crosswinds Open
Based on the Unsteady Reynolds-Averaged Navier-Stokes (URANS) method, this paper studied the effect of the nose shape on the aerodynamic performance when the high-speed train subjected to a windbreak transition under crosswinds. The windbr…
View article: Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models
Aerodynamic effects of the gap spacing between adjacent vehicles on wind tunnel train models Open
A certain gap spacing between adjacent vehicles is usually inevitable in wind tunnel force tests of high-speed trains under no crosswind, which may affect the wind tunnel test results. Thus, to understand the influence of gap spacings on t…
View article: Experimental and numerical research on wind characteristics affected by actual mountain ridges and windbreaks: a case study of the Lanzhou-Xinjiang high-speed railway
Experimental and numerical research on wind characteristics affected by actual mountain ridges and windbreaks: a case study of the Lanzhou-Xinjiang high-speed railway Open
To reduce the impact of a mountain ridge on the crosswind flow field of a specific section of the Lanzhou-Xinjiang high-speed railway, a portion of the mountain ridge was removed to increase the distance from the windbreak. To verify the e…
View article: Experimental and numerical research on the safety of an EMU running on a normal-speed railway line under strong wind
Experimental and numerical research on the safety of an EMU running on a normal-speed railway line under strong wind Open
In order to establish the rapid traffic economic circle in Xinjiang province, there is a plan to operate the EMU (Electric Multiple Units) in Nanjiang normal-speed railway line. But there is few standard and experience that the EMU running…
View article: Comparison of the Trackside Pressure with Respect to Different Nose Lengths of High-Speed Trains
Comparison of the Trackside Pressure with Respect to Different Nose Lengths of High-Speed Trains Open
This paper used the detached eddy simulation (DES) method, compared the effects of different nose lengths of trains on the trackside pressure. The measuring points are arranged according to the CEN standard requirements. It shows that the …
View article: Investigation on Passenger Comfort During HST Operation Using a New App for Smartphones
Investigation on Passenger Comfort During HST Operation Using a New App for Smartphones Open
The interior aerodynamic pressure generated by train operation will bring passengers comfort problems. To better evaluate the feeling of passenger cars during real operation, a new App was designed. Using this App and based on a CRH380B hi…
View article: Three-dimensional Characteristics of the Slipstream Induced by a High-Speed Train Passing through a Tunnel
Three-dimensional Characteristics of the Slipstream Induced by a High-Speed Train Passing through a Tunnel Open
Based on three-dimensional, unsteady, compressible and RNG k-ε turbulence model, the train-induced slipstream inside the tunnel is numerically investigated using CFD software FLUENT. The characteristics of the slipstream at two sides of t…
View article: Aerodynamic Performance of Trains with Different Longitudinal Section Lines under Crosswind
Aerodynamic Performance of Trains with Different Longitudinal Section Lines under Crosswind Open
Aerodynamic analysis of trains with different longitudinal section lines under crosswind was studied using the CFD methods in this paper. The slopes of five different longitudinal section lines are 0.58, 0.54, 0.5, 0.46, 0.42, respectively…
View article: A CFD analysis of the aerodynamics of a high-speed train passing through a windbreak transition under crosswind
A CFD analysis of the aerodynamics of a high-speed train passing through a windbreak transition under crosswind Open
In areas with strong wind, windbreaks are built along railways to reduce the impact of wind on trains. However, because of the restrictions imposed by actual terrain, windbreak structures are often not uniform, such as from a cutting to an…