Natural ventilation (heat source)

Jeremy1995 · June 9, 2019, 22:08

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.

AlexanderZ · June 9, 2019, 22:46

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

best regards

Jeremy1995 · June 9, 2019, 22:48

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

AlexanderZ · June 10, 2019, 00:08

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

best regards

Jeremy1995 · June 10, 2019, 01:21

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

June 9, 2019, 22:08	Natural ventilation (heat source)	#1
Jeremy1995 New Member Join Date: Jun 2019 Posts: 3 Rep Power: 6	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.

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June 9, 2019, 22:46		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	there is a tutorial "natural convection" use it as a reference best regards

June 9, 2019, 22:48		#3
Jeremy1995 New Member Join Date: Jun 2019 Posts: 3 Rep Power: 6	Could you please tell which one? Cause there are so many of them

June 10, 2019, 00:08		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	https://www.youtube.com/watch?v=VNH6Z0p-mxk best regards

June 10, 2019, 01:21		#5
Jeremy1995 New Member Join Date: Jun 2019 Posts: 3 Rep Power: 6	That’s great, thank you. But most interesting is how to set up inlet and outlet boundary conditions