additional phase in polycrystal

[Matthew Spence]

Hi,

If I wanted to add an additional phase into a polycrystal model, how do I reference the polycrystal phase free energy to combine in the multiphase materials? I currently have just added on of the single phase examples in and as expected it just runs along side the polycrystal and doesn't interact.

Thanks,

Matt

[Ahmed, Karim E]

That depends on how you are defining the second phase. Are you using an additional variable? Do you want to evolve that variable? is it coupled to the other variables through the free energy? in general you will add the extra coupled terms as extra kernels with their own contributions to the residual and Jacobian.  

--
You received this message because you are subscribed to the Google Groups "moose-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to moose-users+unsubscribe@googlegroups.com.
Visit this group at https://groups.google.com/group/moose-users.
To view this discussion on the web visit https://groups.google.com/d/msgid/moose-users/d6227880-4ad5-477f-9bc3-c31b18708733%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

Karim El-Sayed Ahmed

Postdoctoral Research Associate 

Fuels Modeling & Simulation Department 

Idaho National Laboratory 

[Matthew Spence]

It's not the additional phase, there are plenty of examples of using multiphase materials etc, its the free energy contribution from the Polycrystal Kernel and GBEvolution Material that I can't see how to use in a multiphase material. I've added the extra phase in already as a variable with all of the kernels and materials needed and it solves fine but it doesn't interact with the polycrystal variables.

Matt 

[Ahmed, Karim E]

If you are using additional variable then its contribution to the residual and Jacobian must be added manually inside the kernel called by the polycrestal action. Also if there is a contribution from the polycrestal variables to the additional variable it must be added to the multiphase kernel. 

You will find an example for such coupling in the polycrestal action itself. If you go to the action you will find ACGBpoly kernel that can add an extra concentration variable to represent the interaction between bubbles and GBs. the concentration equals 1 in the bubble phase and zero in the solid grains. You can turn on this kernel by specifying in the input file c (the concentration) = whatever you want call your additional variable. However, if you want evolve c considering the effect of the order parameters on its evolution you will have to do the same coupling in the kernels that evolve c. 

On Mon, Sep 26, 2016 at 8:51 AM, 'Matthew Spence' via moose-users <moose...@googlegroups.com> wrote:

It's not the additional phase, there are plenty of examples of using multiphase materials etc, its the free energy contribution from the Polycrystal Kernel and GBEvolution Material that I can't see how to use in a multiphase material. I've added the extra phase in already as a variable with all of the kernels and materials needed and it solves fine but it doesn't interact with the polycrystal variables.

Matt 

--

You received this message because you are subscribed to the Google Groups "moose-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to moose-users+unsubscribe@googlegroups.com.
Visit this group at https://groups.google.com/group/moose-users.

To view this discussion on the web visit https://groups.google.com/d/msgid/moose-users/c34bf6d4-ac27-4e46-9c58-810b2ad651fb%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.