Study of the flow around railway embankment of different heights with and without trains

The present work mainly focuses on the evolution of the airflow passing embankments of different heights, with and without trains. Using the delayed detached-eddy simulation (DDES) method, the effects on the velocity and acceleration of the airflow caused by the embankments’ upstream slope were stud...

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Bibliographic Details
Published in:Journal of wind engineering and industrial aerodynamics 2020-07, Vol.202, p.104203, Article 104203
Main Authors: Guo, Zijian, Liu, Tanghong, Chen, Zhengwei, Liu, Zhen, Monzer, Ali, Sheridan, John
Format: Article
Language:English
Subjects:
Crosswind
Embankment
High-speed train
Numerical simulation
Various heights
Wind monitoring points
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Summary:The present work mainly focuses on the evolution of the airflow passing embankments of different heights, with and without trains. Using the delayed detached-eddy simulation (DDES) method, the effects on the velocity and acceleration of the airflow caused by the embankments’ upstream slope were studied using a set of embankments with different heights. The aerodynamic loads experienced by each car of the train, on both the windward and leeward rails, were calculated and the effects of different embankments examined. To distinguish how the geometry of embankments affected the flow patterns, distributions of streamline, velocity and the vortices formed around the head car and embankment are shown. The differences in pressure distribution on central loops of each car caused by the different embankment heights were analyzed at a yaw angle of 19.8°. Using the wind speed at 4 ​m above the actual rails and the reference at 10 ​m above the ground, the effect of wind speed on the aerodynamic forces and moments of the train, independent of the embankments’ height, can be obtained. This method has the potential to simplify the calculations needed to evaluate the safety of trains running on different embankment heights in strong wind environments. •Evolutions of the airflow passing embankments of different heights were compared and analyzed.•Variations in the form of the growth laws for different cars above these embankments were found.•A relationship was established between the wind speeds in two different measuring points.
ISSN:0167-6105
1872-8197
DOI:10.1016/j.jweia.2020.104203