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February 24, 2026Mechanical Engineering JournalOpen Access

Mechanism of aerodynamic force generation related to train vibration in tunnels (Translated) (LES of large-scale flow structures around a simplified train model)

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Authors

KNKoji NAKADEYSYutaka SAKUMATKTakeo KAJISHIMA

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Overview

Large-eddy simulations explore how aerodynamic forces affect high-speed trains in tunnels, indicating key pressure generation mechanisms.

Key Points

  • This research aims to clarify how unsteady aerodynamic forces are generated by train vibrations in tunnels.
  • Conducted large-eddy simulations of flow structures around a simplified six-car train model.
  • Analyzed airflow in both tunnel environments and open-air conditions for comparison.
  • Examined the effects of varying distances between the train and tunnel walls.
  • Identified shear flows and Kármán vortices affecting pressure along the sides of the train.
  • Found that meandering airflow causes pressure fluctuations in both tunnel and open-air conditions.
  • Estimated the wavelength of pressure fluctuations on the actual train based on simulation results.

Cite This Study

NAKADE et al. (2026) studied this question.

synapsesocial.com/papers/699d3f9ede8e28729cf644d7https://doi.org/10.1299/mej.25-00397
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