Hi, I think I understand what you are talking about. In general aviation aircraft, The VSI (Vertical Speed Indicator) works with a pierced bottle of air. And the air passing through that hole "drives" the needle to indicate how fast the airplane is climbing or descending.
This gives a rather inacurate instrument, which has a lot of delay (about 2 seconds) and instructors tell their student pilots they shouldn't rely on it so much.
So I was wondering : would we get a more realistic behaviour of the VSI (for small aircraft) if the whole pressure system was mathematical modeled to calculate the value displayed by the VSI?