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Mixture Model Simulation using General Form PDE

Posted Dec 19, 2011, 12:40 p.m. EST Fluid & Heat, Computational Fluid Dynamics (CFD), Microfluidics Version 4.2 2 Replies

Rui Silva
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Hi folks,

I am using the Mixture Model with K-Epsilon to model solid liquid turbulent flow.
The problem is the overshoot in the turbulence generation of the standard k-epsilon model.
I have pressure values higher than I should.

Since you cannot couple Low Reynolds with the Mixture Model (I am presuming, since I haven't found anything in this matter), I will have to employ General Form PDEs.

I was wondering if anyone has some experience in this matter...

I could use some help, either in the form of existing models or tutorials.

Best Regards,

Rui
2 Replies Last Post May 28, 2012, 5:11 a.m. EDT
COMSOL Moderator

Hello Rui Silva

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If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Matt Jackson
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Posted: 1 decade ago May 27, 2012, 3:23 a.m. EDT
Hello,

Have you made any headway on this issue?

I'm looking to model a dense, miscible mixture (Euler-Euler is perfect), but k-omega turbulence is essential and not provided in tandem with any of the mixture models.

I was thinking it could be programmed explicity or, as you suggested, coupling the models together, but I have no clue how this could be done in COMSOL.

Cheers,
-M
Hello, Have you made any headway on this issue? I'm looking to model a dense, miscible mixture (Euler-Euler is perfect), but k-omega turbulence is essential and not provided in tandem with any of the mixture models. I was thinking it could be programmed explicity or, as you suggested, coupling the models together, but I have no clue how this could be done in COMSOL. Cheers, -M
Rui Silva
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Posted: 1 decade ago May 28, 2012, 5:11 a.m. EDT
Hello Matt,

I was not successful in coupling the models. And using PDE proved also unsuccessful due to the fact that applying numerical stabilization is very trick in PDE Mode.

So I was left with the option of modifying the mixture model.

I am having some success but still far from complete.

Hope this helps.

Best Regards,

Rui Silva
Hello Matt, I was not successful in coupling the models. And using PDE proved also unsuccessful due to the fact that applying numerical stabilization is very trick in PDE Mode. So I was left with the option of modifying the mixture model. I am having some success but still far from complete. Hope this helps. Best Regards, Rui Silva

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