[Annier]

Hi Sebastian,
I recently came across this literature http://math.arizona.edu/~meissen/doc...interfaces.pdf to learn that Allen-Cahn and Cahn-Hilliard equations are the canonical forms of reaction-diffusion systems. Apart from bubble evolution in molten metals(250 degree centigrade); I am also interested in how a bubble prevents the growth of Intermetallic Compounds for solid Cu/Sn/Cu joint (150 degree centigrade). The main thing is : "At working temperature of 150 degree centigrade, i just have solids. I want to know whether this exclusively implements (1) phase field model (PFM) (2) Some other solid mechanics solver".

Yours
Anil Kunwar

[gigilentini8]

Originally Posted by nero235

Anil,

you don't need the C-H model for your purpose. The normal VOF model can simulate the agglomeration of the bubbles also.

Regards

I agree, of course.
unless you want to model phase separation or bubbles that, depending on the thermodynamic condition, have mixed miscibile/immiscible behavior (not usually the case in normal conditions)

[nero235]

Anil,

the biggest problem will be to find a solver which can handle this kind of complex physics. You need a multiphase solver (> 2 phases) which can handle energy transport and phase change! There's no official solver in OF from what I know. And you probably won't find an unofficial one also.

Clearly the solver I am working on is not suitable for that since it is based on interFoam, which is limited to 2 phases.

I suggest you start looking for a solidification solver which includes phase change an energy transport. This would be more suitable for your case.

Hope this helps. Regards, Sebastian

[Andrew_Sm]

Originally Posted by nero235

Hello Anil,

the VOF or EULER methods have a different background. These methods differ in the treatment of the whole multiphase system. The VOF method uses an additional equation (alpha = phase fraction) apart from 1 set of navier stokes equations for all phases to distinguish between multiple phases whereas the EULER method uses 3N navier stokes equations for N phases. However neither can be used to simulate phase separation because the diffusion mechanisms in the navier stokes and alpha eqn are missing.

The Cahn Hilliard model doesn't replace the alpha eqn of the VOF model. It just adds a diffusion term to the alpha eqn and replaces the CSF (continuum surface force) model in the navier stokes eqn, since diffusion is a primary transport mechanism during the phase separation.

Are you familiar with OF programming? I am asking because I am not done with that solver. I would like to release a version which works

Kind regards, Sebastian

Sebastian,

Have you released any information in conference/paper? Please provide the citation link

Thanx

[nero235]

Hey Andrew,

no, I have not released any paper yet. Are you interested in the CH solver?

Regards, Sebastian

[mjallad]

Dear nero235,

Im interested in the solver of the cahn-hilliard equation, since im working on a final year project to dimonstrate the equation in openfoam, how can I get the solver to try it?

Thank you in advance,
Maher

[jdpeterson3]

nero235,

I am interested to hear how your experience with the Cahn Hilliard model in OpenFOAM concluded. Were you able to formulate a stable model, and if so, how did you treat the fourth order terms?

Thanks,

Joe

[nero235]

Originally Posted by jdpeterson3

nero235,

I am interested to hear how your experience with the Cahn Hilliard model in OpenFOAM concluded. Were you able to formulate a stable model, and if so, how did you treat the fourth order terms?

Thanks,

Joe

Hey Joe,

I haven't done much on this topic lately since I had to work on another problem first. I have been in contact with Holger Marschall though who is developing another solver for the Cahn-Hilliard model in OF. He has much more experience in this field and therefore I am waiting for his release of the solver, which should be soon.

However there is a solver from A. Donaldson which was written for an old OF version. I've begun porting it to a 2.2 version. Check out the git repo for that: https://github.com/11101011.

Regards, Sebastian

[ARUNAVA SENGUPTA]

Hi Sebastian,

I got the phaseFieldFoam code from the link (https://github.com/11101011). While trying to compile the original code in the OpenFoam version 30, i am getting a lot of errors. can you help me out rectifying those errors or do you have the latest version of the code for the OpenFOAM version 30 ?

regards

[winsway]

i have some confusion with phase field and hope you solve my confusion.I don't know whether phase field is suitable for the calculation and simulation of multi-phase turbulence. Most of the literature is VOF and level set. I hope you can provide some help~

[Enrico Segre]

FWIW, I managed to compile Sebastian's port of Adam Donaldson's code with openFoam 6, blindly adapting a few lines. The fork is here. Adam's most relevant paper describing the code is probably this one, btw.
With that I won't say that I'm sure that the computation is correct, only that the code seems to run plausibly. For the cases I'm currently interested into, i.e. microfluidics, it may be not the right approach. At the sizes of my system, surface tension sigma and contact angle theta seem to have no effect. Maybe my port missed something, maybe it's a limitation of the modelling. There are another couple of research codes out there which I still want to try, before resigning to VOF. Feedback appreciated!

[fallwind]

Originally Posted by nero235

Hey Joe,

I haven't done much on this topic lately since I had to work on another problem first. I have been in contact with Holger Marschall though who is developing another solver for the Cahn-Hilliard model in OF. He has much more experience in this field and therefore I am waiting for his release of the solver, which should be soon.

However there is a solver from A. Donaldson which was written for an old OF version. I've begun porting it to a 2.2 version. Check out the git repo for that: https://github.com/11101011.

Regards, Sebastian

Hi Sebastian,
i'm also interested in Holger Marschall's solver, have you got it?

[azad_786]

Hello All,
Has anyone developed a solver using phase field method to solve C-H equation and diffusion equation for solidification of a binary alloy?
Thanks

[azad_786]

Hello Foamers,
Have you been able to develop Phase-Field solver using OpenFOAM.
I am interested in the solver that solves the Cahn-hilliard 4th order diffusion equation.
Please let me know.
Thanks

[azad_786]

Originally Posted by ARUNAVA SENGUPTA

Hi Sebastian,

I got the phaseFieldFoam code from the link (https://github.com/11101011). While trying to compile the original code in the OpenFoam version 30, i am getting a lot of errors. can you help me out rectifying those errors or do you have the latest version of the code for the OpenFOAM version 30 ?

regards

Hi Arunava,
Have you been able to develop the PhaseField solver using OpenFOAM
?

[xiaomk]

Originally Posted by Enrico Segre

FWIW, I managed to compile Sebastian's port of Adam Donaldson's code with openFoam 6, blindly adapting a few lines. The fork is here. Adam's most relevant paper describing the code is probably this one, btw.
With that I won't say that I'm sure that the computation is correct, only that the code seems to run plausibly. For the cases I'm currently interested into, i.e. microfluidics, it may be not the right approach. At the sizes of my system, surface tension sigma and contact angle theta seem to have no effect. Maybe my port missed something, maybe it's a limitation of the modelling. There are another couple of research codes out there which I still want to try, before resigning to VOF. Feedback appreciated!

Hi, have you solved the problem that the contact angle theta has no effect?