[CIG-SHORT] Pylith time stepping viscoelastic

[Francisco Delgado]

HI Matt, thanks, I'll give that a try

On Wed, May 11, 2016 at 5:17 PM, Matthew Knepley <knepley at rice.edu> wrote:

> On Wed, May 11, 2016 at 4:02 PM, Francisco Delgado <fjd49 at cornell.edu>
> wrote:
>
>> Hi Tabrez, it's a 3D simulation and it's slow in the sense that it will
>> take more than 1 day to run the 4 years simulation. The only thing I plan
>> to change is the chamber time pressurisation, so the stiffness matrix will
>> not change. Hence, wow can I change the solver?
>>
>
> --petsc.pc_type lu
> --petsc.pc_factor_mat_solver_package mumps/superlu
>
>   Thanks,
>
>     Matt
>
>
>> Thanks
>>
>> On Wed, May 11, 2016 at 3:55 PM, S Tabrez ALI <stali at geology.wisc.edu>
>> wrote:
>>
>>> Which part is currently slow and is this a 2D or 3D case? You can
>>> perhaps try a sparse direct solver. The first solve will be slow but the
>>> rest should go fast (assuming the stiffness matrix is not changing).
>>>
>>>
>>> Tabrez
>>> ------------------------------
>>> *From:* CIG-SHORT <cig-short-bounces at geodynamics.org> on behalf of
>>> Francisco Delgado <fjd49 at cornell.edu>
>>> *Sent:* Wednesday, May 11, 2016 1:26:25 PM
>>> *To:* cig-short at geodynamics.org
>>> *Subject:* [CIG-SHORT] Pylith time stepping viscoelastic
>>>
>>> Dear Pylith developers
>>>
>>> I'm running a viscoelastic simulation of a pressurised magma chamber
>>> surrounded by a viscoelastic shell with a viscosity of 2*1e16 Pa s, a shear
>>> modulus of 30 GPa. The latter figures imply a stable time step of 0.0042
>>> years which will produce a very slow simulation over a period of 4 years in
>>> terms of computing time. Hence I wonder if there a way to increase the
>>> simulation speed.
>>>
>>> Thanks
>>>
>>> --
>>> --------------------------------------------------------
>>> Francisco Delgado
>>> PhD student in Geological Sciences
>>> Cornell University
>>>
>>> _______________________________________________
>>> CIG-SHORT mailing list
>>> CIG-SHORT at geodynamics.org
>>> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>>
>>
>>
>>
>> --
>> --------------------------------------------------------
>> Francisco Delgado
>> PhD student in Geological Sciences
>> Cornell University
>>
>> _______________________________________________
>> CIG-SHORT mailing list
>> CIG-SHORT at geodynamics.org
>> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>
>
>
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-- 
--------------------------------------------------------
Francisco Delgado
PhD student in Geological Sciences
Cornell University
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