Natural ventilation (heat source)
 

Hello!
I am trying to solve the problem of natural ventilation. Say we have a fluid domain (air) inside a vertical pipe, inlet is at the bottom edge of the pipe, outlet is at the top edge. We have a heat source inside the pipe 1000 watt per cubic meter which warms up the fluid inside the pipe. Initially before the heat source is activated no flow through the pipe exists. But after the source starts working temperature of the internal fluid starts growing, warm air goes up which creates flow inside the pipe.
Could you please help me how to set up boundary conditions. It shouldn’t be just velocity inlet.
I know how to set up heat source.

there is a tutorial "natural convection"
use it as a reference

best regards

Could you please tell which one? Cause there are so many of them

https://www.youtube.com/watch?v=VNH6Z0p-mxk

best regards

That’s great, thank you. But most interesting is how to set up inlet and outlet boundary conditions