Natural Convection in a vertical duct

Hamilton · March 18, 2015, 07:43

Dear guys,
I want to simulate natural convection in a vertical duct to calculate the hot air mass flow rate which is suctioned from duct (attached figure). In fact I do not kniw which boundary condition should be used in inlet and outlet. If I use wall then the mass flow is zero and if I use velocity or mass flow inlet I have not value for them. Please help me.

Sincerely

Topgun79 · March 18, 2015, 11:32

You can use Pressure inlet and pressure outlet and keep the pressure the same at either end i.e. zero.

ghost82 · March 18, 2015, 11:51

It's not simple to set boundary conditions in this case.
I know that one of the methods is to extend the domain, so that boundary conditions will not affect too much the flow in the channel.
You can try to read this, maybe you will find what you are searching:

https://tel.archives-ouvertes.fr/hal-00841302/document

March 18, 2015, 11:51		#3
ghost82 Senior Member Rick Join Date: Oct 2010 Posts: 1,016 Rep Power: 26	It's not simple to set boundary conditions in this case. I know that one of the methods is to extend the domain, so that boundary conditions will not affect too much the flow in the channel. You can try to read this, maybe you will find what you are searching: https://tel.archives-ouvertes.fr/hal-00841302/document __________________ Google is your friend and the same for the search button!

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March 18, 2015, 11:32		#2
Topgun79 New Member Haroon Junaidi Join Date: Mar 2015 Posts: 4 Rep Power: 11	You can use Pressure inlet and pressure outlet and keep the pressure the same at either end i.e. zero.