[aspect-devel] Visco-Plastic material model

[John Naliboff]

Hi Mohamed,

I think loading the values in manually is the way to go, to many 
different flow law options people may want to use.

FYI, each composition can already be assigned different material 
properties.  Please try out the material model and let us know what 
works and does not work!  There will be constant issues to work out with 
any models using non-linear viscosity in combination with plasticity.

Cheers,
John


On 05/24/2016 02:13 AM, Mohamed Gouiza wrote:
>
> Hi John,
>
> Are you thinking that someone could specify “quartzite” for a specific 
> composition and have the values be loaded in?  My preference is to 
> have the user input the values themselves, as this way the can modify 
> specific values for testing purposes.
>
> I was thinking that one can either choose to specify “Quartzite” and 
> have the values loaded in or input the values manually. But having a 
> table with the different flow laws is an excellent idea.
>
> The most important, in my view, is what is already on your to-do list: 
> strain-weakening, elasticity, and the possibility to assign each 
> composition field with a specific creep law (diffusion, dislocation, 
> or composite).
>
> Cheers,
>
> Moh.
>
> *From:*Aspect-devel [mailto:aspect-devel-bounces at geodynamics.org] *On 
> Behalf Of *John Naliboff
> *Sent:* 23 May 2016 18:34
> *To:* aspect-devel at geodynamics.org
> *Subject:* Re: [aspect-devel] Visco-Plastic material model
>
> Hi Mohamed,
>
> Elasticity is not currently included, but that is on the summer to-do 
> list.
>
> Pre-defined flow laws - I think the defaults are for the Hirth and 
> Kohlstedt (2003) dry olivine flow laws.
>
> I’m not sure how different pre-defined flow laws could be incorporated 
> into the input file in a straightforward manner.
>
> Are you thinking that someone could specify  “quartzite” for a 
> specific composition and have the values be loaded in?  My preference 
> is to have the user input the values themselves, as this way the can 
> modify specific values for testing purposes.
>
> A list of the flows (including scaled values of ‘A’) would be useful 
> to have somewhere, though.  Others have suggested having a table 
> somewhere on the CIG website.  Does this sound like a good idea?
>
> Cheers,
>
> John
>
> *************************************************
>
> Assistant Project Scientist, CIG
>
> Earth & Planetary Sciences Dept., UC Davis
>
>     On May 23, 2016, at 1:06 AM, Mohamed Gouiza <M.Gouiza at leeds.ac.uk
>     <mailto:M.Gouiza at leeds.ac.uk>> wrote:
>
>     Hi John,
>
>     Thanks you for the quick reply.
>
>     Strain-weakening would be very useful indeed.
>
>     Is flexure/elasticity of the lithosphere incorporated?
>
>     It would also be nice to have predefined rheologies (e.g.
>     Quartzite: Gleason & Tullis (1995); Olivine: Karato & Wu 1993)
>     which can be scaled.
>
>     Regards,
>
>     Moh.
>
>     *From:*Aspect-devel
>     [mailto:aspect-devel-bounces at geodynamics.org]*On Behalf Of*John
>     Naliboff
>     *Sent:*20 May 2016 13:56
>     *To:*aspect-devel at geodynamics.org
>     <mailto:aspect-devel at geodynamics.org>
>     *Subject:*Re: [aspect-devel] Visco-Plastic material model
>
>     Hi Mohamed,
>
>     The visco-plastic material model is not available in the new
>     release, but should be incorporated into the master version any
>     day now.
>
>     Do note that strain-weakening is not incorporated yet, but it will
>     hopefully be soon (before or during hackathon).
>
>     I plan to continuously add features to this material model, so
>     please let me know if there is something you would like added.
>      Alternatively, by all means incorporate a feature into your
>     version of the code and do a pull request!
>
>     Cheers,
>
>     John
>
>     *************************************************
>
>     Assistant Project Scientist, CIG
>
>     Earth & Planetary Sciences Dept., UC Davis
>
>         On May 20, 2016, at 2:25 AM, Mohamed Gouiza
>         <M.Gouiza at leeds.ac.uk <mailto:M.Gouiza at leeds.ac.uk>> wrote:
>
>         Hi John,
>
>         I am trying to build a Viscoelastic-frictional-Plastic
>         materiel model, to model deformation of a layered lithosphere.
>
>         I’ve just seen that you’ve made a Visco-Plastic material model
>         and I wanted to know if it is included in the new release
>         (that I haven’t had time to check yet)
>
>         Thank you
>
>         Regards
>
>         -------------------------------------------------
>         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
>         -------------------------------------------------
>
>         _______________________________________________
>         Aspect-devel mailing list
>         Aspect-devel at geodynamics.org <mailto:Aspect-devel at geodynamics.org>
>         http://lists.geodynamics.org/cgi-bin/mailman/listinfo/aspect-devel
>
>     _______________________________________________
>     Aspect-devel mailing list
>     Aspect-devel at geodynamics.org <mailto:Aspect-devel at geodynamics.org>
>     http://lists.geodynamics.org/cgi-bin/mailman/listinfo/aspect-devel
>
>
>
> _______________________________________________
> Aspect-devel mailing list
> Aspect-devel at geodynamics.org
> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/aspect-devel

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.geodynamics.org/pipermail/aspect-devel/attachments/20160524/d8b808e2/attachment-0001.html>