how to set density as boussinesq?

mariam.sara · February 23, 2017, 11:09

hello I want solve nature convection problem and I do not know how I can set density as boussinesq in CFX please help ?

Thanks

ghorrocks · February 23, 2017, 16:50

In the material properties define a thermal expansivity, under Buoyancy properties. Then if you select a buoyancy model in the domain you will be using the Boussinesq buoyancy model.

evcelica · February 27, 2017, 15:22

Quote:

Originally Posted by ghorrocks

In the material properties define a thermal expansivity, under Buoyancy properties. Then if you select a buoyancy model in the domain you will be using the Boussinesq buoyancy model.

Yes, as long as you have defined constant density. If you define variable density or use ideal/real gas, then the full buoyancy model will be used.

February 23, 2017, 11:09	how to set density as boussinesq?	#1
mariam.sara Senior Member Join Date: Jan 2011 Posts: 339 Rep Power: 16	hello I want solve nature convection problem and I do not know how I can set density as boussinesq in CFX please help ? Thanks

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February 23, 2017, 16:50		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,723 Rep Power: 143	In the material properties define a thermal expansivity, under Buoyancy properties. Then if you select a buoyancy model in the domain you will be using the Boussinesq buoyancy model.