Impact of the windbreak transition on flow structures of the high-speed railway and mitigation using oblique structure and circular curve structure transition

Zheng Wei Chen, Guang Zhi Zeng, Syeda Anam Hashmi, Tang Hong Liu, Lei Zhou, Jie Zhang, Hassan Hemida

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Purpose: This paper aims to investigate the variations in the flow fields induced by transition regions in the windbreak structures between the flat ground and the cutting along a railway and to propose mitigation measures to improve the windproof ability of the windbreak. Design/methodology/approach: The improved delayed detached eddy simulation method was used to simulate the impact of the windbreak transition on flow structures of the high-speed railway under different wind angles, and also the accuracy of the numerical results was validated with those of the wind tunnel test. Findings: The results showed that the original windbreak transition region resulted in a dimensionless peak wind velocity of 0.62 and 0.82 for railway line-1 at wind angles of 90° and 75°, respectively, and the corresponding values were 0.81 and 0.97 for railway line-2. The flow structure analysis revealed the reason for the mismatched height in the transition region, and the right-angle structures of the windbreaks resulted in ineffective protection and sudden changes in the wind speed and direction. Two mitigation measures – oblique structure (OS) and circular curve structure (CCS) transition walls – were developed to reduce the peak wind speed. The OS provided superior protection. The peak value of dimensionless wind velocity was all less than 0.2 for OS and CCS. Originality/value: The flow field deterioration mechanism induced by the inappropriate form of a windbreak transition at different wind angles was examined, and effective mitigation and improvement measures were proposed and compared with the original transition.

Original languageEnglish
Pages (from-to)1354-1378
Number of pages25
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
Volume33
Issue number4
DOIs
Publication statusPublished - 24 Apr 2023

Keywords

  • CFD
  • Flow structures
  • Mitigation measures
  • Railway aerodynamics
  • Windbreak transition

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

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