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Tunnel modelling : the collaboration with the CETU

B. Carissimo, S. Lacour , H. Foudhil,L. Musson-Genon, E. Dupont, M. Milliez, B. Albriet, E. Demael, L. Laporte,. Atmospheric CFD modelling for environmental applications at local scale ,. Tunnel modelling : the collaboration with the CETU. History. CETU: ventilation and environment team

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Tunnel modelling : the collaboration with the CETU

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  1. B. Carissimo, S. Lacour, H. Foudhil,L. Musson-Genon, E. Dupont, M. Milliez, B. Albriet, E. Demael, L. Laporte, Atmospheric CFD modelling for environmental applications at local scale, Tunnel modelling : the collaboration with the CETU

  2. History • CETU: ventilation and environment team • Technical service of the Equipment Ministry • Defining state of art, methods for studying tunnels • Conception of fire protection system • Environmental studies around tunnels Collaboration with the CEREA started in 2002

  3. Modelling tools Mercure_Saturne reactive version Polair3D local: • RACM chemistry • Eulerian advection diffusion scheme Reactive plume/box models • Street model, OSPM …

  4. Dispersion around a tunnel portal Vehicle induces flows in a non-ventilated tunnel. HVG passing produced a high frequency signal on flow velocity Tunnel also filters vehicle drag effect and produced low frequency variations on the flow velocity

  5. Dispersion around a tunnel portal Pollutant escape occurs earlier in the street in the case of unsteady flows Advection effects were found greater than turbulent ones. Street concentration decrease is lower than 30% in unsteady cases Lacour and al., UAQ 2003

  6. Dispersion around a tunnel portal Street NO2 concentration increases From 0% when the primary background pollution is high Up to 100 % in case of ozone peaks Ozone availability is a limitation factor for NO conversion near the exit

  7. Dispersion around a tunnel portal Statistical analysis were made for 2 different urban aeras Reactive models (OPSM1, OSPM2, TNO, Street) were compared Dilution factors were established for NO2 reactive dispersion around tunnel portal Guide méthodologique « Etude d’environnement » CETU 2005

  8. Dispersion around a tunnel portal

  9. Dispersion around a tunnel portal Building affects plume geometry in this campaign The validation of the CEREA model, developed for flat terrain, is not possible with these measurements.

  10. Dispersion around a tunnel portal wind NO2 concentration field Reactive NO2 model was used to study depollution effectiveness of catalytic walls. A measurement campaign would be carried out by the CETE of Lille around a tunnel portal in Paris and used for validation purposes

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