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The growing mobility of persons and goods, the faster cruising speeds of mass transit, the development of more and longer tunnel sections and increased awareness of safety and environmental impacts are just some of the crucial factors that are driving manufacturers and operators to continuously improve the comfort and performances of their systems as well as the safety of human beings and infrastructures.

Against this backdrop, and in the confined space of the tunnel, aerodynamic and thermal phenomena, the spread of smoke in the event of a fire, comfort and emergency ventilation, the flow and evacuation of persons, the intervention of emergency services and the protection of people and infrastructures now play a critical role and are given consideration early in the design phase of new transport systems and underground structures, as well as when modernising the existing infrastructures.

Our engineers – thanks to their long experience, their skill and their excellent theoretical knowledge – are able to work on all these important topics. They produce studies and projects relating to aerodynamics, thermodynamics and ventilation as well as others for the evacuation and management of pedestrian flows. To do so, they use mathematical calculations, experimental measurements and numerical simulations carried out with well-known software:

  • Fluent, StarCCM, FDS, NSMB, which are 3D aerodynamic solvers for the study of fires and unsteady flows in complex geometries;
  • SimWalk, a software application for simulating and analysing pedestrian flows;

or with our own software, ad hoc developed and approved by our engineers:

  • TNT, a 1D aerodynamic solver for calculating the unsteady air flow field, the smoke propagation and the evacuation of people through a tunnel network;
  • TunClim, a 2x1D thermodynamic solver, for calculating long-term changes in temperature within deep tunnel networks.


Domains of activities

  • Tunnels
  • Rail and bus stations
  • Underground infrastructure
  • Car parks, garages and depots
  • Buildings
  • Enclosed spaces
  • Vehicles


Related core competencies


References and software