Numerical simulation of the aerodynamic characteristics of double unit train
| Autor: | Zhengwei Chen, Hongkang Liu, Zijian Guo, Tanghong Liu, Hassan Hemida |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION
General Computer Science ComputingMethodologies_SIMULATIONANDMODELING Computer science drag component Mechanical engineering 02 engineering and technology aerodynamic force 01 natural sciences 010305 fluids & plasmas Unit (housing) 0203 mechanical engineering 0103 physical sciences double-unit train Open air detached eddy simulation (des) Unit train Computer simulation Aerodynamics Aerodynamic force 020303 mechanical engineering & transports lcsh:TA1-2040 Modeling and Simulation numerical simulation open air Train lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | Engineering Applications of Computational Fluid Mechanics, Vol 14, Iss 1, Pp 910-922 (2020) |
| ISSN: | 1994-2060 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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