[aspect-devel] melt in the visco plastic model

[Mohamed Gouiza]

Hi Juliane, John,

Thank you for the feedback.

Mohamed.

From: Aspect-devel [mailto:aspect-devel-bounces at geodynamics.org] On Behalf Of Juliane Dannberg
Sent: 23 November 2016 20:19
To: aspect-devel at geodynamics.org
Subject: Re: [aspect-devel] melt in the visco plastic model


Hi Mohamed,

I would also like to add that combining melt migration and plasticity will make the problem strongly nonlinear, and probably very difficult for both the linear and the nonlinear solver. So if your viscosity contrast is high, you should expect a large number of linear iterations (this could be up to 1000) and a large number of nonlinear iterations.

We are working to make both parts faster, but at the moment you will probably need a lot of computational resources to run these kind of models, and we haven't tested ASPECT with this kind of models, so other problems might come up.

Cheers,
Juliane

On 11/23/2016 01:15 PM, John Naliboff wrote:
Hi Mohamed,

With some work it is certainly possible to combine the functionality of the visco plastic material model and 'melting' components of the code.

However, do note that the visco plastic model is incompressible and the melting material models are inherently compressible.  My suggestion is to use the 'melt simple' material model as a starting point and then add in the features in 'visco plastic'.

However, this seems like a good time to release a general cautionary note about moving to quickly on this front.  I am still in the process of doing sensitivity tests with the provided extension models and adding in melting is likely going to require a huge amount of additional testing to obtain robust convergence behavior and results.

I certainly encourage you to move forward with the idea, but just keep in mind that this is not a trivial numerical exercise in any way, shape or form.

Cheers,
John



*************************************************

John Naliboff

Assistant Project Scientist, CIG

Earth & Planetary Sciences Dept., UC Davis
On 11/23/2016 08:19 AM, Mohamed Gouiza wrote:
Hi All,

Is there a way to combine the visco plastic material model with the melt simple material model?

I want to set up a model that simulate lithospheric extension and induce melt generation and transport at various stages of the extension.

Thank you

-------------------------------------------------
Mohamed Gouiza, Research Fellow
Basin Structure Group, Institute of Applied Geosciences
University of Leeds, School of Earth and Environment
Leeds,  LS2 9JT, UK
M.Gouiza at leeds.ac.uk<mailto:M.Gouiza at leeds.ac.uk>
+44 7985 782073
-------------------------------------------------





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