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Model for ventilation of vehicular tunnels
Innovative Research, Inc., in collaboration with Parsons Brinckerhoff, Inc., has developed a comprehensive
mathematical model for predicting fluid flow, heat transfer, and smoke transport in vehicular tunnels. The model has been validated using the data from the Memorial Tunnel Test program.
The model
is intended for use by individuals with fire/life safety. The model is designed to simulate the interaction between the events associated with tunnel fire and the ventilation system to determine unsafe
regions within the tunnel.
The tunnel fire model can handle longitudinal, transverse, and combined ventilation systems. It has the ability to predict both steady-state and transient conditions.
The input for the model is provided through a customized graphical user interface. The specific details of the model are as follows:
- It is based on the three-dimensional form of the governing equations.
- It uses the buoyancy-corrected k-e model for simulating turbulence.
- The fire is represented as a source of energy and smoke.
- It includes option for detailed calculation of thermal radiation.
- A jet fan is modeled as a constant volumetric flow rate device. Mass sources and sinks are introduced to model the jet fan.
- The duct network for a transverse ventilation system is represented via a flow network. There is complete interaction
between the CFD model for the tunnel and network model for the duct system.
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