[DarrenC]

Hi All,

I have a question regarding Lagrangian Particle Tracking in Eulerian-Eulerian Multiphase Flow that I hope you guys can help me with. It is loosely related to an old thread, namely this one :

http://www.cfd-online.com/Forums/cfx...-tracking.html

A quick rundown of my simulation : I am looking at a 3 phase oil-water-gas separator and i am trying to inject some sand at the inlet to see how it disperses in the gas phase only.

I know there are 2 methods in cfx - Lagrangian Particle Tracking and Euler-Euler. I want to do both cases to see the difference, but I just want to clarify 1 specific question regarding Particle Tracking in Euler-Euler multiphase simulations.

In the thread ghorrocks mentioned that we can stick a Lagrangian Particle Tracking model on top of one continuous phase of the Euler-Euler multiphase simulation. But when I do this (DomainName > BasicSetting > Sand > Morphology > Particle Transport Solid), a warning sprouts up :

"In Analysis 'Flow Analysis 1' - Domain 'ExtensionInlet': Particle tracking simulations with more than one continuous Eulerian phase are not supported."

Also under fluid pair the sand material is paired with every continuous phase, namely water, oil and gas.

According to the excerpt from the manual that ghorrocks pointed out in the aforementioned thread, this should be possible (Given that my understanding that Particle Transport Solid option means Lagrangian Particle Tracking is correct).

So my question is how do you define the particle tracking in one of the continuous phase only? I hope you guys can help me shed some light on this.

For sand particles using purely Euler-Euler approach, I think I have the settings right based on what I read from the tutorials. Basically what I do is just define the sand as a "Dispersed Solid" instead. Then I can basically define the interphase transfer models in 'Fluid Pair' to reflect what I want to see in the gas phase only. Is this correct?

Sorry for the long message. I hope my question is clear and you guys can shed some light on this for me.

Thank you very much!

Cheers
DarrenC