Hello everybody. I am quite new to this topic an I am trying to get into CFD simulation.
On a first try, i want so simulate a parking garage with natural ventilation, that means, there are no active fans, etc. for the ventialtion .Just openings in two oppositely walls.
The parking garage is about 50 x 60 m and has 7 openings on each of the 60m walls.
To simulate the natural ventilation i set velocity intels at the 7 openings on the one side (i estimated the Flow rate to 1 m3/s) an 7 velosity outlets (also 1 m3/s) on the openings at the oppositely walls.
You can find the project here
So, i just want do get some feedback by the experts here, whether this is the right approach.
The Tutorials are always with active ventialtion, so i couldn’t get more information there
I think you have done quite a good job.
I personally would use a pressure outlet instead of a velocity outlet, because this can prevent the continuity of mass flow is given if the surface area of the inlet and outlet is not equal.
I guess the rest looks okay, the residuals for pressure could be better but that is mostly related to mesh quality, which for such a huge fluid volume can get up quite high.
Yes 0 Pascal, will also just be the starting condition since the pressure will change due to the simulation behavior.
No, when you define a flowrate for an inlet, the air will enter the fluid domain with the given flowrate. For an outlet, the air will exit the fluid domain with that flowrate. Therefore you can just define a positive flow rate.
If you have the diffussion coefficient of hot smoke (and if it is really diluted) you could use a passive scalar and evaluate its concentration in the domain. There are plenty of tutorials/cases using it. I do not think a multiphase approach is required at all for a ventilation study.