Wind and Structures

Techno-Press (테크노프레스)
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Experimental and numerical study on aerodynamic characteristics of suspended monorail trains passing each other under crosswinds

  • Yulong Bao (Institute of Smart City and Intelligent Transportation, Southwest Jiaotong University) ;
  • Wanming Zhai (State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University) ;
  • Chengbiao Cai (State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University) ;
  • Shengyang Zhu (State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University) ;
  • Yongle Li (National Key Laboratory of Bridge Intelligent and Green Construction, Southwest Jiaotong University)
  • Received : 2022.09.26
  • Accepted : 2023.10.18
  • Published : 2023.11.25
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Abstract

Suspended monorail trains (SMTs) are sensitive to crosswinds, and instantaneous aerodynamic characteristics of two SMTs passing each other under crosswinds are particularly complicated. In this study, a pressure measurement test is carried out on stationary train-bridge models arranged in several critical positions. In addition, a validated moving CFD model is developed with the dynamic and sliding mesh method to explore the realistic train movement effects. The time-varying aerodynamic forces and surface pressure distribution on, as well as the flow field around running trains and bridges during trains passing each other, are computed in detail to illustrate the shielding effect of the upstream train. The results reveal that when two trains begin to pass each other, the side force coefficient of the downstream train reduces significantly to negative values due to the wind shielding effect of the upstream train. The moving model successfully captures that airflow is separated on the middle line of the head car for the suspended monorail train, and the surrounding bluff double-beams can significantly affect the flow structures around the train. The wind shielding effect of the upstream train on the downstream train will weaken as the relative yaw angle decreases.

Keywords

Acknowledgement

The authors are grateful for the financial supports from the National Natural Science Foundation of China (grant number U19A20109, 52108476) and China Postdoctoral Science Foundation (grant number 2020TQ0249), Natural Science Foundation of Sichuan Province (grant number 2022NSFSC1905), Fundamental Research Funds for the Central Universities (grant number 2682022CX059). The content of this paper reflects the views of the authors, who are responsible for the facts and the accuracy of the information presented.

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