The bogie-induced flow characteristics of two referenced variations of a streamlined high-speed train model, with and without bogie shields, are numerically studied by performing improved delayed detached eddy simulation. The results show that covering the bogies reduces the overall aerodynamic drag by 45%, primarily due to a significant reduction in pressure drag caused by the smoother underbody. While a localized increase in slipstream velocity is observed near the train's rear, the wake activity is diminished, resulting in a substantial drop in the nondimensional slipstream velocity to approximately 0.01 in the wake region, with decreases of 93% and 80% at a height of z* = 0.11 and 0.44, respectively. Additionally, the maximum turbulence intensity downstream of the bogie region decreased by 97% and the lateral motion of wake vortices was found to stabilize, with dominant frequencies occurring at StW = 0.139 and 0.425. These findings provide good references for the aerodynamic assessment of future high-speed trains.
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Numerical investigation of bogie-induced flow disturbances around a streamlined high-speed train
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December 2024
Research Article|
December 05 2024
Numerical investigation of bogie-induced flow disturbances around a streamlined high-speed train
Special Collection:
Flow and Civil Structures
Yitong Wu (吴依桐)
;
Yitong Wu (吴依桐)
(Data curation, Formal analysis, Funding acquisition, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Wei Zhou (周伟)
;
Wei Zhou (周伟)
a)
(Conceptualization, Funding acquisition, Methodology, Supervision)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Xifeng Liang (梁习锋)
;
Xifeng Liang (梁习锋)
(Conceptualization, Methodology)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Xinchao Su (苏新超)
;
Xinchao Su (苏新超)
a)
(Formal analysis, Software, Validation, Writing – review & editing)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Kewei Xu (徐可为)
;
Kewei Xu (徐可为)
(Validation, Writing – review & editing)
4
Department of Mechanical Engineering, Maine College of Engineering and Computing, University of Maine
, Orono, Maine 04469, USA
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Yutao Xia (夏玉涛)
;
Yutao Xia (夏玉涛)
(Validation, Writing – review & editing)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Zhixin Wang (王祉歆)
;
Zhixin Wang (王祉歆)
(Visualization)
1
Key Laboratory of Traffic Safety on Track, Ministry of Education, School of Traffic and Transportation Engineering, Central South University
, Changsha 410075, China
2
Joint International Research Laboratory of Key Technology for Rail Traffic Safety, Central South University
, Changsha 410075, China
3
National & Local Joint Engineering Research Center of Safety Technology for Rail Vehicle
, Changsha 410072, China
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Sinisa Krajnović
Sinisa Krajnović
(Supervision, Writing – review & editing)
5
Division of Fluid Dynamics, Department of Mechanics and Maritime Sciences, Chalmers University of Technology
, SE-41296 Gothenburg, Sweden
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Physics of Fluids 36, 125133 (2024)
Article history
Received:
October 21 2024
Accepted:
November 07 2024
Citation
Yitong Wu, Wei Zhou, Xifeng Liang, Xinchao Su, Kewei Xu, Yutao Xia, Zhixin Wang, Sinisa Krajnović; Numerical investigation of bogie-induced flow disturbances around a streamlined high-speed train. Physics of Fluids 1 December 2024; 36 (12): 125133. https://doi.org/10.1063/5.0244625
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