Learning Forum

[jackhc0609]

how to open the multiphase to set the volume fraction in VOF?multiphase is grey

[Rob]

You need to use the correct magical incantations. That and change from "mixture" to "phase-2".  I also advise calling "phase-1" something more useful so it makes sense when seen on post processing. "Phase-1-air" may be sensible. 

[jackhc0609]

IT DOES NOT HELP.

[Rob]

Hang on, why are you setting the phase fraction in a cell zone? I'd missed that. 

[jackhc0609]

to set the volume fraction of vof .phase 0.5 volumefraction

[Rob]

That's not how the VOF model works: it's a free surface tracking model. Have you done the tutorial?  https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v242/en/flu_tg/flu_tg_vof.html

[jackhc0609]

the two phases volume fraction can not be set in VOF ?

[Rob]

They can, but that's not how you do it.  Have you done the tutorial?

[jackhc0609]

AHA it is in the inlet boundary condition to set the volume fraction 

[Rob]

Yes, and also check the model requirements before setting 0.5