An additional pressure quantity

[Er9y714]

In some cases, I observe non-physical pressure behavior, such as a positive pressure in a compartment with leakages when all doors are suddenly closed. Developers noted that sudden door closing is not a realistic method, so the pressure measurement behavior was not considered an issue. I could not find a more realistic, feasible-to-build door-closing setup, but there may be a workaround as suggested earlier.

If we subtract the initial value of the device (T=0) than the measured ABSOLUTE PRESSURE (or BACKGROUND PRESSURE) we get a reasonable reading compared to PRESSURE.
This can be done by postprocessing or multiple CTRL, DEVC items in the simulation.

I was wondering if there is another QUANTITY which can perform this in a more simple way without additional steps. Is this possible? If not, could you please consider adding this new quantity?

Thank you for considering its feasibility.

[drjfloyd]

If something can be done fairly easily using control logic and existing outputs, we generally prefer not to add that as an additional output quantity. We added the CTRL capability in large part to address these types of requests.

If you have a fire in a compartment and you close the door, the spike behavior is a result of the instant closing. However, after than if the fire is increasing temperature in the compartment then the pressure will also need to increase until the leakage volume flow catches up with the expansion of the gas due to temperature.

[Er9y714]

Okay, I understand, I will continue using post-processing. Thank you for considering.

The pressure device is not in the fire compartment but an adjacent lobby. Stair well - lobby - fire compartment. Both stair well and fire compartment are connected to outside. Before closing the doors an extract fan (opens to lobby) ramps down to zero.