Community Research and Development Information Service - CORDIS

Tools for Fire Simulation in Underground - OSIS

This 1D code is a simplified approach suitable for modeling underground networks and simulate the effects of a fire on the whole ventilation system, what CFD codes can't do due to the amount of resources they require. The objectives are the following:

- Assess smoke temperature and follow the spread of smoke in the galleries downstream to the fire seat

- Compute air flow distribution in the network taking into account thermal effects on pressure losses and fan thrust

General design is based on the VENTITEC Program developed by TEC INGENIERIE and the additional fire model called FEUTEC.

Ventitec is a ventilation program that computes pressure and air flow distribution in a network when temperature distribution is given. The fire model Feutec has to compute the temperature field given fire characteristics and flow distribution. The two codes run alternatively at each time step.

The software can work in standalone mode or in conjunction with the 3D model developed by WS ATKINS. In standalone mode, a simplified model of fire is used to determine initial characteristics of smoke fronts. It assumes that the heat release rate increases linearly with time and that smoke temperature follows a predefined curve.

At each time step, a new front of smoke is emitted. Its characteristics are either assessed by the simplified fire model or given by the CFD code STAR CD in case of coupling of the 2 codes. The fire model then manages fronts evolution in the galleries, taking into account heat exchange with walls.

Reported by

1 Avenue A. Einstein
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