Are existing source terms in CFX linearized (for example buoyancy, cavitation models)

JuPa · November 3, 2015, 07:50

Hi

Are existing source terms in CFX linearized (for example buoyancy, cavitation models)?

As in, are the linearization coefficients already taken into consideration?

ghorrocks · November 3, 2015, 17:25

Some yes, some no. I know the surface tension one is not very well linearised and that is why surface tension slows CFX down so much. But most of the rest are well linearised.

A crude way to tell is to run a model with and without the model and see how much it slows down. If convergence is much slower then the linearisation is probably not too good.

JuPa · November 4, 2015, 03:29

Thank you

November 3, 2015, 07:50	Are existing source terms in CFX linearized (for example buoyancy, cavitation models)	#1
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 14	Hi Are existing source terms in CFX linearized (for example buoyancy, cavitation models)? As in, are the linearization coefficients already taken into consideration?

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November 3, 2015, 17:25		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Some yes, some no. I know the surface tension one is not very well linearised and that is why surface tension slows CFX down so much. But most of the rest are well linearised. A crude way to tell is to run a model with and without the model and see how much it slows down. If convergence is much slower then the linearisation is probably not too good.

November 4, 2015, 03:29		#3
JuPa Senior Member Mr CFD Join Date: Jun 2012 Location: Britain Posts: 361 Rep Power: 14	Thank you