Numerical study for the aerodynamic performance of double unit train under crosswind

Zijian Guo, Tanghong Liu, Miao Yu, Zhengwei Chen, Wenhui Li, Xiaoshuai Huo, Hongkang Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

54 Citations (Scopus)

Abstract

The present work focused on the aerodynamic performance of double unit trains (DUT) and traditional single unit trains (SUT) under crosswinds. The aerodynamic coefficient as well as the characteristics of the time-averaged and instantaneous flow of the SUT and DUT were calculated using the improved delayed detached eddy simulation (IDDES) method for 1/8th scale models. The numerical results were verified by wind tunnel tests. The time-averaged flow pattern on different cross-sections and horizontal planes were compared for the SUT and DUT. The pressure coefficients on the loops of different cars were also analyzed quantitatively. The vortices around the SUT and DUT were visualized, and the frequency characteristics of each car of the SUT and DUT were computed. The coupling region changed the forces on the train and increased the overall drag of the train. Faster vortex development was found on the last three cars of the DUT. Furthermore, a higher velocity belt was generated by the gap of the coupling region. The coupling region gave a significant influence of the power spectrum densities (PSD) on the last four cars and a relatively slight impact on the first two cars.

Original languageEnglish
Pages (from-to)203-214
Number of pages12
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume191
DOIs
Publication statusPublished - Aug 2019
Externally publishedYes

Keywords

  • Crosswind
  • Double unit train
  • Frequency characteristics
  • IDDES
  • Numerical simulation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Renewable Energy, Sustainability and the Environment
  • Mechanical Engineering

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