[CIG-SHORT] Kinematic fault convergence

[Charles Williams]

Hi Nick,

Brad and I have both run your problem using the fieldsplit settings, and the solution converges in 179 iterations.  I’m not sure what problem you’re trying to solve, but there is a huge vertical uplift that overwhelms any movement on the faults.  Also, we would advise you to use much higher mesh resolution near the center of the mesh (you should probably use a graded mesh).  Also, you may need to extend your outer boundaries further.

Cheers,
Charles


> On 14/03/2017, at 7:58 AM, Nick Wogan <nicholaswogan at gmail.com> wrote:
> 
> Charles,
> 
> I see what you are referring to. Importing the .exo file into trelis/cubit does show there to be free surfaces in the mesh. This is strange because before I export the mesh there are no free surfaces and I have imprinted/merged the geometry successfully (before meshing) in trelis. After i export the mesh as .exo and then import it back into trelis is says there are free surfaces.
> 
> Attached are journal file examples.
> 
> Nick
> 
> On Sun, Mar 12, 2017 at 2:15 PM, Charles Williams <willic3 at gmail.com <mailto:willic3 at gmail.com>> wrote:
> Dear Nick,
> 
> After a quick look at your mesh, it appears that there are a number of free surfaces still in your mesh, which indicates to me that you may not have merged things.  I am not certain whether that is responsible for your problems, but I would delete unused free surfaces and make sure everything is merged when you create your mesh.
> 
> Cheers,
> Charles
> 
> 
>> On 11/03/2017, at 12:28 PM, Nick Wogan <nicholaswogan at gmail.com <mailto:nicholaswogan at gmail.com>> wrote:
>> 
>> Hi Charles or Brad,
>> 
>> Some simulations I am running with kinematic faults are not converging.. 
>> 
>> Attached is an example. W4_nofault.cfg and W4_withfault.cfg are the same simulation (and mesh) except W4_nofault.cfg has no faults implemented, while W4_withfault.cfg has two kinematic faults with 10 m of reverse slip prescribed on each fault. 
>> 
>> W4_withfault.cfg doesn't converge, W4_nofault.cfg does converge.
>> 
>> What am I doing wrong? What solver settings should I be changing?
>> 
>> Thanks,
>> Nick Wogan
>> <fault_example.zip>_______________________________________________
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> Charles Williams I Geodynamic Modeler
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Charles Williams I Geodynamic Modeler
GNS Science I Te Pῡ Ao
1 Fairway Drive, Avalon 5010, PO Box 30368, Lower Hutt 5040, New Zealand
Ph 0064-4-570-4566 I Mob 0064-22-350-7326 I Fax 0064-4-570-4600
http://www.gns.cri.nz/ <http://www.gns.cri.nz/> I Email: C.Williams at gns.cri.nz <mailto:your.email at gns.cri.nz>
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