Meshing error : intersections in the flow volume

Hello,
I am new on Simscale and I’m trying to model the movement of smoke in a tunnel when there is a fire.
I follow the car park tutorial to help me create the simulation.
But when I want to run the simulation a error appears :“One or more cell zones do not intersect the flow region or the intersection results in a non-solid body. Cell zones must overlap with the flow region.”
I already saw a post on that error, but I don’t understand what I have to do. Does the car have to be in contact with the flow region ?
here is a link of my project Essai après prise en main 2 | SimScale Workbench
thank you very much for your help

Hi chene_et_chalm

i guess the issue is that you have subtracted the car from the wind tunnel, and are using it as a momentum source.

What you can do is to is the moving wall boundary condition.

Also I would sugesst you to switch the outlet to a pressure outlet with a mean value of 0 Pa to have this as ambient pressure.

Please let us know if this solved your issue.

Best regards
Sebastian

Hello !
Thank you so much for your quik answer !
I don’t succed in using the wall boundary coundition so I use the susbstrat function of the CAD mode and it seems to work. The simulation is running !
Thank you angain for you help