[rednass]

Hello,

I am currently creating a simulation of a tunnel with wind conditions. It is just a basic square tunnel of 100m length.
To simulate the wind I add a positive dynamic pressure to an open vent at the inlet. I also added two pressure devices in the middle of the tunnel at the inlet and the outlet.
You can clearly see the flow starting up in the beginning and finally the volume flow comes to a certain maximum, as shown in the next figure:


The results of the pressure devices are shown below:

The pressure in is reducing from the pressure which is set, up to around 12 Pa.

The pressure out hovers around 0 Pa.


Can anyone explain the pressure plots? Why is the pressure in changing in time, and not the pressure out?

[FMDenaro]

you should provide more details about the method and setup of your simulation