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

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?

:confused:

Help! Thank you!

It does interest me 2.

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.

Hi Tommy

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

yeah
 

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.

Thanks Tommy for your reply!

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

Thanks again