Communication Dans Un Congrès Année : 2019

CFD study of dispersion of particles generated by mechanical braking: application to trains in underground stations

Résumé

The exposure to particulate matter (PM) has become a major issue in the last decade since it is responsible for the enhancement of several adverse health effects. These troubles include respiratory and cardiovascular diseases. Trains generate and resuspend particles when they brake. Combined with confinement effects in underground stations it leads to high particle mass concentration rates. Commuters and workers are exposed to particulate pollution while standing on platforms and inside carriages where outer particles can infiltrate through leakages, windows and doors. In the present study, a CFD study is undertaken to investigate particle dispersion from train brakes. This includes their interaction with the flow induced by train motion. The airflow is computed using Reynolds-Average Navier-Stokes (RANS) equations with the Reynolds Stress Model (RSM) for turbulence problem closure. Particles trajectories are computed by means of Lagrangian tracking. Results show that particles dynamics are strongly influenced by the flow around the train. Three regions affecting particles dispersion are highlighted: bogie cavities, inter-gaps and the near-wake of the train. The flow induced by the train, if considered alone, does not seem to play a significant role in dispersion towards the platform. However, it is responsible for the enhancement of particles vertical dispersion.

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Dates et versions

hal-02359380 , version 1 (12-11-2019)

Identifiants

  • HAL Id : hal-02359380 , version 1

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Antoine Durand, Amine Mehel, Frédéric Murzyn, Samuel Puech, Frédérique Larrarte. CFD study of dispersion of particles generated by mechanical braking: application to trains in underground stations. WCRR2019, 12th World Congress on Railway Research, Oct 2019, Tokyo, Japan. 6p. ⟨hal-02359380⟩
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