Walls’ material: Concrete (characteristics from FDS library).cell dimensions: 1 m * 0.512 m * 0.5 m.forced ventilation: 2 fans x 250 m3/s exhaust, situated at 950 m from the entry portal.So, in order to clarify the correlation between the roughness of the walls and Darcy’s friction factor value, I performed several simulations without fire, in the empty tunnel, and could not reach any conclusion (see 180720PressLossNoSlip5_devcLambda.fds). the correlation between the wall roughness and Darcy’s friction factor “f”? The use of FDS has been challenged by one of our international consultant concerning the computing of the linear pressure losses, i.e.
I am presently in the situation of validating the design of the ventilation system for a road tunnel.
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