Comparison between steady and moving railway vehicles subjected to crosswind by CFD analysis

Premoli, Antonio; Rocchi, Daniele; Schito, Paolo; Tomasini, Gisella Marita

doi:10.1016/j.jweia.2016.07.006

Cited by 69 publications

(26 citation statements)

References 14 publications

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“…The realisable k-ε model with wall functions was adopted to simulate aerodynamic forces acting on a high-speed train (Cheli et al, 2010). Premoli et al (2016) investigated the effect of the relative motion between train and infrastructure using SST k- model. 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.…”

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

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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%

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 all experimental settings in wind tunnel tests are also identically used in the validation case. A lot of related studies (Dorigatti et al, 2015;Premoli, Rocchi, Schito, & Tomasini, 2016) show that the aerodynamic loads of the train are only depend on the resultant wind velocity as a result of the combination of train speed and incoming wind velocity. With reference to Figure 1, the actual resultant wind speed V r with a yaw angle β on the train, is straightforward to be obtained from the following expressions:…”

Section: Cfd Validationmentioning

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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“…The flow fields at different positions during overtaking are shown in Figure 13. Contrary to Car 1, Car 2 is always in the unstable flow field induced by Car 1 (Premoli et al, 2016). Thus, the variation of the aerodynamic forces and moments of Car 2 is relatively complex.…”

Section: Aerodynamic Performancementioning

confidence: 99%

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The aerodynamic performance and dynamic response of two cars in overtaking maneuver under crosswind were investigated using a multi-car two-way coupling method. The coupling was achieved by exchanging aerodynamic forces obtained by computational fluid dynamic and vehicle dynamic responses acquired by multi-body dynamics in real time. The change rules of the aerodynamic force, moment, yaw angle, and lateral displacement of overtaking and overtaken cars were revealed on the basis of coupling computation. The coupling effect between aerodynamics and dynamics and the interplay between overtaking and overtaken cars were also illustrated. Moreover, the necessity of the two-way coupling was verified. Final results indicated that the posture of the body and the lateral space of the two vehicles are crucial to the stability of the vehicles during the overtaking maneuver, and the interaction between the aerodynamic forces and the dynamic response should be considered.

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Comparison between steady and moving railway vehicles subjected to crosswind by CFD analysis

Cited by 69 publications

References 14 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

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

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

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