Hello all,
I am having problems with high negative pressures within my simulation. I am using FDS 6.7.9, but have also tested the model in 6.8.0, with the same results.
The model consists of a stairwell, lobby, corridor and fire compartment. When the door between the lobby and stairwell is open, i am getting over 200Pa pressure difference across the door when the extract in the lobby is running at 3m3/s.
I have run test models of just the stairwell as well as the stairwell and lobby. The pressure problem does not arise in these test models. To construct the test models, I used the 'problem' model and removed the fire compartment and corridor. I did not make any changes to the lobby or stairwell.
There are pressure sensors within the stairwell and these corroborate the slices.
I have attached images of the problem and the comparison with the test model. I have also attached my input file.
Any help would be greatly appreciated.