Rail and metro tunnels

IDA Tunnel addresses the main climate and safety issues in underground rail systems1, and it relies on a graphical user interface for definition of the tunnel model.

A schematic representation of computational components, such as tunnel sections, branches, platforms, fans, etc. are accompanied by a 3D view, where computed results and moving trains can be animated in the context of a full 3D representation of the tunnel network.


Mapping sections and platforms


IDA Tunnel permits long-term studies using measured climatic data, including moisture, and complex schedules. Train movement under normal traffic and emergency conditions are simulated, based on user-supplied acceleration, retardation, and maximum power and speed parameters. Stochastic traffic patterns may be described to avoid artificial train synchronization effects.




1D (one-dimensional) air movement driven by train piston effect, buoyancy (stack effect) and wind pressure is modeled as well as air moisture with wall evaporation, condensation and ice build-up.


The following additional air properties are presently computed:

  • Age, i.e. total time spent underground.
  • Carbon dioxide - mostly generated by occupants.
  • Particle concentration, e.g. PM10 as generated by train movements.
  • Optical extinction coefficient of fire and diesel smoke.
  • CO, NOX and HC, as generated by diesel engines.



1 except pressure transient discomfort



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