"Full" buoyancy model in CFX

Jade M · March 8, 2010, 16:14

ANSYS CFX distinguishes between a "full" buoyancy model as opposed to a Boussinesq buoyancy model for turbulence. What is meant by a "full" buoyancy model?

Is this something intrinsic to CFX or is this a fundamental question related to turbulence modelling?

Thanks so much for any information!

marupio · March 16, 2010, 21:59

Full buoyancy uses the density variations in the fluid to calculate buoyancy force. Boussinesq is for incompressible fluids - "pseudo" buoyancy. It approximates the density variations with a correlation to the temperature variation.

Jade M · March 18, 2010, 12:08

Thanks! I see. So then is "full" buoyancy equivalant to a compressible flow model? It seems that there are some differences between the two?

Thank you very much for any further information!

March 8, 2010, 16:14	"Full" buoyancy model in CFX	#1
Jade M Senior Member Join Date: Feb 2010 Posts: 148 Rep Power: 17	ANSYS CFX distinguishes between a "full" buoyancy model as opposed to a Boussinesq buoyancy model for turbulence. What is meant by a "full" buoyancy model? Is this something intrinsic to CFX or is this a fundamental question related to turbulence modelling? Thanks so much for any information! tianjunjie likes this.

March 18, 2010, 12:08	"Full" Buoyancy	#3
Jade M Senior Member Join Date: Feb 2010 Posts: 148 Rep Power: 17	Thanks! I see. So then is "full" buoyancy equivalant to a compressible flow model? It seems that there are some differences between the two? Thank you very much for any further information!

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March 16, 2010, 21:59		#2
marupio Senior Member David Gaden Join Date: Apr 2009 Location: Winnipeg, Canada Posts: 437 Rep Power: 22	Full buoyancy uses the density variations in the fluid to calculate buoyancy force. Boussinesq is for incompressible fluids - "pseudo" buoyancy. It approximates the density variations with a correlation to the temperature variation.