Numerical simulation of the aerodynamic characteristics of double unit train
Double unit trains running at high speeds may create additional aerodynamic challenges due to two streamlined structures with close proximity, exploring the aerodynamic performance of double unit trains is now critical. In this study, detached eddy simulation (DES) approach was employed to study the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2020-01-01
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| Series: | Engineering Applications of Computational Fluid Mechanics |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/19942060.2020.1784798 |
| _version_ | 1818562254930444288 |
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| author | Zijian Guo Tanghong Liu Hassan Hemida Zhengwei Chen Hongkang Liu |
| author_facet | Zijian Guo Tanghong Liu Hassan Hemida Zhengwei Chen Hongkang Liu |
| author_sort | Zijian Guo |
| collection | DOAJ |
| description | Double unit trains running at high speeds may create additional aerodynamic challenges due to two streamlined structures with close proximity, exploring the aerodynamic performance of double unit trains is now critical. In this study, detached eddy simulation (DES) approach was employed to study the aerodynamic performance and the nearby flow patterns of a double unit train, whose results were compared and analyzed with that of a single-unit train with a same length. The results showed that the coupling method could change the aerodynamic drag on each car and tended to increase the overall drag of the double unit train. The lift force of the front car near the coupler was significantly increased. Similar slipstream distributions were found around the front half single and double-unit train except in a region close to the coupler. Due to the coupling structure, the slipstream of the rear half of double unit train was much stronger compared to single unit train. The vortex region behind the double-unit train was much wider than that of the single-unit train and was accompanied by greater vortex-shedding. |
| first_indexed | 2024-12-14T01:01:18Z |
| format | Article |
| id | doaj.art-f97faef5d32e4cc19380ac93f878b943 |
| institution | Directory Open Access Journal |
| issn | 1994-2060 1997-003X |
| language | English |
| last_indexed | 2024-12-14T01:01:18Z |
| publishDate | 2020-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Engineering Applications of Computational Fluid Mechanics |
| spelling | doaj.art-f97faef5d32e4cc19380ac93f878b9432022-12-21T23:23:14ZengTaylor & Francis GroupEngineering Applications of Computational Fluid Mechanics1994-20601997-003X2020-01-0114191092210.1080/19942060.2020.17847981784798Numerical simulation of the aerodynamic characteristics of double unit trainZijian Guo0Tanghong Liu1Hassan Hemida2Zhengwei Chen3Hongkang Liu4Key Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversitySchool of Engineering, University of BirminghamKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityKey Laboratory of Traffic Safety on Track of Ministry of Education, School of Traffic & Transportation Engineering, Central South UniversityDouble unit trains running at high speeds may create additional aerodynamic challenges due to two streamlined structures with close proximity, exploring the aerodynamic performance of double unit trains is now critical. In this study, detached eddy simulation (DES) approach was employed to study the aerodynamic performance and the nearby flow patterns of a double unit train, whose results were compared and analyzed with that of a single-unit train with a same length. The results showed that the coupling method could change the aerodynamic drag on each car and tended to increase the overall drag of the double unit train. The lift force of the front car near the coupler was significantly increased. Similar slipstream distributions were found around the front half single and double-unit train except in a region close to the coupler. Due to the coupling structure, the slipstream of the rear half of double unit train was much stronger compared to single unit train. The vortex region behind the double-unit train was much wider than that of the single-unit train and was accompanied by greater vortex-shedding.http://dx.doi.org/10.1080/19942060.2020.1784798aerodynamic forcedouble-unit traindrag componentnumerical simulationdetached eddy simulation (des)open air |
| spellingShingle | Zijian Guo Tanghong Liu Hassan Hemida Zhengwei Chen Hongkang Liu Numerical simulation of the aerodynamic characteristics of double unit train Engineering Applications of Computational Fluid Mechanics aerodynamic force double-unit train drag component numerical simulation detached eddy simulation (des) open air |
| title | Numerical simulation of the aerodynamic characteristics of double unit train |
| title_full | Numerical simulation of the aerodynamic characteristics of double unit train |
| title_fullStr | Numerical simulation of the aerodynamic characteristics of double unit train |
| title_full_unstemmed | Numerical simulation of the aerodynamic characteristics of double unit train |
| title_short | Numerical simulation of the aerodynamic characteristics of double unit train |
| title_sort | numerical simulation of the aerodynamic characteristics of double unit train |
| topic | aerodynamic force double-unit train drag component numerical simulation detached eddy simulation (des) open air |
| url | http://dx.doi.org/10.1080/19942060.2020.1784798 |
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