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CFD Study on Smoke Extraction Efficiency during Tunnel Fires
Abstract:
Problem statement
Analysis Methodology
Meshing
- As a CFD Company, our CFD Consultants studied the case using Pressure based solver in the Transient Case simulated for 100 seconds.
- We have used Realizable k-e model in our Fluid Flow Analysis to consider the turbulent effects in flow.
- Energy equation is switched on to consider the heat transfer effects inside the tunnel.
- As part of the scope of work for our CFD Analysis Services, We have used Discrete Ordinate Radiation Model, Multi Species Model to give the mass fractions of CO, CO2, and hydrogen in the smoke.
- We have assigned the above mixture as a material property to the fluid domain inside the tunnel and Heat source with 20MW energy is assigned to the 1m^3 cube which we have modeled in the Pre Processor. And above CO, CO2, H2 mass fractions produced by the Heat source.
- As we are having two different parts here that is, Fluid domain inside the Tunnel and Heat Source, We have given fluid-fluid interface between the two domains.
Outcome & Result
- Velocity, pressure streamline contours
- Co, CO2 concentration at a different time step of the CFD Flow Analysis
- Smoke mass concentration vs time
- Flow separation
Conclusion
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