Crosswind Effect Studies on Road Vehicle Passing by Bridge Tower using Computational Fluid Dynamics

Wang, Bin; Xu, You Lin; Zhu, Linbo; Li, Yongle

doi:10.1080/19942060.2014.11015519

Cited by 22 publications

(17 citation statements)

References 12 publications

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“…The mean velocity of the incoming flow, U m , was 60 m/s, which was composed of the wind speed and train speed, and the yaw angle, β, was 15°, which is defined in Figure 2. The velocity inlet boundary has typically been used to simulate the incoming flow (García et al, 2015;Hemida & Krajnović, 2009b;Morden, Hemida, & Baker, 2015;Wang, Xu, Zhu, & Li, 2014) because it simplifies the method for defining its characteristics. The uniform (and constant in time) velocity profile of U m was used for the velocity inlet boundary.…”

Section: Computational Model and Boundary Conditionsmentioning

confidence: 99%

Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

Niu

Zhou

Liang

2017

Engineering Applications of Computational Fluid Mechanics

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The focus of this study was the influence of the length of a train on its aerodynamic performance, with and without wind break walls, under a crosswind. The improvement in the train's aerodynamic performance due to a wind break wall was also analyzed. Aerodynamic coefficients such as the drag force and lateral force were obtained for trains of different lengths using a numerical simulation. A delayed detached eddy simulation based on the shear-stress transport κ-ω turbulent model was used in Fluent 14.0 to simulate the unsteady aerodynamic performances of trains of different lengths under a crosswind. Through a comparison and analysis of the simulation results, the effects of the train length on the forces, pressure, and flow structure around the train were studied, along with the influence of a wind break wall on trains of different lengths. The results showed that the effects on the forces, pressure, and flow structure were focused in the region around the train tail. Furthermore, it was found that a wind break wall could improve the aerodynamic characteristics of a train under a crosswind, but amplified the influence of the train length on the aerodynamic performance of the train tail. These research results provide useful guidance for train operations under a crosswind. ARTICLE HISTORY

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Section: Computational Model and Boundary Conditionsmentioning

confidence: 99%

Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

Niu

Zhou

Liang

2017

Engineering Applications of Computational Fluid Mechanics

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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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“…Therefore, viaducts and bridges that are routinely exposed to crosswind CONTACT A. Alonso-Estébanez alonsoea@unican.es conditions can be the cause of both safety and economic issues. As a consequence, several studies have investigated the impact of crosswinds on bridges (Wang, Xu, Zhu, Cao, & Li, 2013;Wang, Xu, Zhu, & Li, 2014). Some studies have focused on the development of procedures to regulate traffic (Cheung & Chan, 2010;Guo & Xu, 2006), while other research has studied wind fence efficiency (Kozmar, Procino, Borsani, & Bartoli, 2012;Rocchi, Rosa, Sabbioni, Sbrosi, & Belloli, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Vehicles suffer huge instabilities under crosswind conditions (Argentini, Ozkan, Rocchi, Rosa, & Zasso, 2011;Wang et al, 2014) at the towers on the bridges. In Charuvisit et al (2004) the effect of tower geometry on vehicle stability was studied.…”

Section: Introductionmentioning

confidence: 99%

“…During this study, the main difficulties arose when setting the grid parameters, selecting one turbulence model between the options provided by FLUENT and proposing the most interesting study cases. In order to overcome these difficulties, on the one hand several numerical models with different grid sizes and turbulence models were solved and, on the other hand, investigations were conducted which focused on the effect of crosswind conditions on traffic safety in bridge decks (Dorigatti et al, 2012;Wang et al, 2013Wang et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of bus aerodynamics on several classes of bridge decks

Alonso-Estébanez

Díaz

Rabanal

et al. 2016

Engineering Applications of Computational Fluid Mechanics

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This paper is focused on improving traffic safety on bridges under crosswind conditions, as adverse wind conditions can increase the risk of traffic accidents. Two ways to improve traffic safety are investigated: improving vehicle stability by means of wind fences installed on the bridge deck and by modifying the design parameters of the infrastructure. Specifically, this study examines the influence of different parameters related to the bridge deck configuration on the aerodynamic coefficients acting on a bus model under crosswind conditions. The aerodynamic coefficients related to side force, lift force and rollover moment are obtained for three classes of bridge deck (box, girder and board) by numerical simulation. FLUENT was used to solve the Reynolds-averaged Navier-Stokes (RANS) equations along with the shear stress transport (SST) k-ω turbulence model. Two crash barriers located on the box bridge deck were replaced with an articulating wind fence model and the effect of the angle between the wind fence and the horizontal plane on the bus aerodynamic was investigated. The risk of rollover accidents was found to be slightly influenced by the bridge deck type for a yaw angle range between 75°and 120°. In order to study the effect of the yaw angle on the aerodynamic coefficients acting on bus, both the bus model and the bridge model were simultaneously rotated. The minimum value of the rollover coefficient was obtained for an angle of 60°between the wind fence slope and the horizontal plane. The only geometry parameter of the box bridge deck which significantly affects bus aerodynamics is the box height. The present research highlights the usefulness of computational fluid dynamics (CFD) for improving traffic safety, studying the performance of the articulating wind fence, and determining which geometry parameters of the box deck have a significant influence on the bus stability.

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Crosswind Effect Studies on Road Vehicle Passing by Bridge Tower using Computational Fluid Dynamics

Cited by 22 publications

References 12 publications

Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

Numerical investigation of the aerodynamic characteristics of high-speed trains of different lengths under crosswind with or without windbreaks

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

Numerical simulation of bus aerodynamics on several classes of bridge decks

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