How to decide interfacial length scale in Mixture Model of CFX multiphase simulation?

TommySean · July 15, 2010, 03:50

The help file of CFX solver theory guide says that for the mixture model the interfacial length scale must be specified. And an equation about calculating this d.ab from (r.a, r.b,d.a,d.b) is provided.

However, when both fluid are treated as continuous fluid, how do I get the d.a and d.b?

TommySean · July 18, 2010, 10:51

Help! Thank you!

Zaktatir · September 29, 2010, 06:16

It does interest me 2.

ghorrocks · September 29, 2010, 08:21

I do not know how to specify it. But if you do a sensitivity study you might find it does not matter anyway. If not you better work it out.

haider760 · March 20, 2012, 05:51

Hi Tommy

Did you find out how to define mixture length scale for two continuous fluids?

TommySean · April 6, 2012, 22:48

Quote:

Originally Posted by haider760

Hi Tommy

Did you find out how to define mixture length scale for two continuous fluids?

The mixture length is just to provide a parameter to calculate the interfacial area. If both or at least one fluid is particle, it may be easy to understand how CFX calculate that interfacial area. The mixture length, can be taken as just another software interface that facilitates the user input. At the background, the CFX software will calculate another value for use in the computation.

I haven't used CFX for several months. If you can leave an email here, I'd like to send you some pictures that illustrates the effects of various mixture length or particle diameter settings.

haider760 · April 6, 2012, 23:46

Thanks Tommy for your reply!

It would be great if you share details on haider760@gmail.com

Thanks again

July 15, 2010, 03:50	How to decide interfacial length scale in Mixture Model of CFX multiphase simulation?	#1
TommySean New Member Tommy Join Date: Jul 2010 Posts: 10 Rep Power: 15	The help file of CFX solver theory guide says that for the mixture model the interfacial length scale must be specified. And an equation about calculating this d.ab from (r.a, r.b,d.a,d.b) is provided. However, when both fluid are treated as continuous fluid, how do I get the d.a and d.b?

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July 18, 2010, 10:51		#2
TommySean New Member Tommy Join Date: Jul 2010 Posts: 10 Rep Power: 15	Help! Thank you!

September 29, 2010, 06:16		#3
Zaktatir Senior Member Join Date: Jan 2010 Location: Germany Posts: 268 Rep Power: 17	It does interest me 2.

September 29, 2010, 08:21		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I do not know how to specify it. But if you do a sensitivity study you might find it does not matter anyway. If not you better work it out.

March 20, 2012, 05:51		#5
haider760 New Member Haider Muhammad Join Date: Dec 2011 Posts: 5 Rep Power: 14	Hi Tommy Did you find out how to define mixture length scale for two continuous fluids?

April 6, 2012, 23:46		#7
haider760 New Member Haider Muhammad Join Date: Dec 2011 Posts: 5 Rep Power: 14	Thanks Tommy for your reply! It would be great if you share details on haider760@gmail.com Thanks again