[CIG-SHORT] Problem with fault intersection in 3D simulations

[Josimar Alves da Silva]

Hi Surendra,

Thank you for your suggestion ! I am able to run my simulation fine now and
I don't get the previous error message. In this approach what you suggest
is to split the Thrust fault in two different faults that are not connected
(with the strike slip fault between them). I assume that the new Thrust
fault segments are allowed to slip independently now, correct ?

Charles, do you have any comments regarding this solution proposed by
Surendra ? Have you done something similar in the past ?

thank you,
Josimar










On Wed, Feb 14, 2018 at 12:29 AM, Surendra Nadh Somala <surendra at iith.ac.in>
wrote:

> Josimar,
>
> From your zipped figure, I see that there are nodes on the strike slip
> fault that also belong to the thrust fault.
>
> After creating the nodeset for thrust_fault in Cubit/Trelis, add a line in
> your .jou file (immediately before creating a label for thrust fault
> nodeset) to remove all nodes that belong to the strike slip (assuming your
> strike-slip fault is the main fault).
> Export the new .exo file after making these changes to your boundary
> condition journal file of Cubit and try to run pylith with the update
> Exodus mesh.
>
> -Surendra
>
>
> ___________
> *Surendra Nadh Somala*
> Assistant Professor
> Department of Civil Engineering (Block-E, 208)
> Indian Institute of Technology (IIT) Hyderabad
> Kandi, Sangareddy
> Telangana, India - 502285
> Phone : +91 (0)40 2301-8457 <+91%2040%202301%208457>
> http://civil.iith.ac.in/surendra/
>
> On Tue, Feb 13, 2018 at 10:42 PM, Josimar Alves da Silva <
> jsilva.mit at gmail.com> wrote:
>
>> Hi Brad, Charles and Matt
>>
>> I am having trouble in running a 3D PyLith simulation with 2 intersecting
>> faults and I am wondering if you can help me. The problem occurs when I run
>> the simulation with both faults on the domain. Note that I have already run
>> the simulation with each fault independently and found no problems.
>>
>> The error message says the following (see also attached the full log
>> containing the  error message ):
>>
>> RuntimeError: Error occurred while adjusting topology to create cohesive
>> cells for fault 'Thrust_fault'.
>>
>> Error in topology of mesh associated with symmetry of adjacency
>> information.
>>
>>
>> See attached also figures for information regarding how I am defining
>> the fault buried edges, specially regarding the intersection part. Note
>> that neither  fault goes all the up to the surface and they terminated
>> inside the domain.
>>
>>
>> I know this problem was often discussed to be related to the mesh element
>> quality. An histogram of the mesh quality for all elements on my domain
>> show that the mesh quality is as required for PyLith (< 3 ).
>>
>>
>> If it helps, I am attaching also the configuration file (.cfg) containing
>> the information regarding my simulation set up. Note  the that I am
>> constrained to use pylith version 2.1.3, however using version 2.2  did not
>> give a different error message.
>>
>>
>> Please let me know if you have any suggestions on how to solve this
>> problem.
>>
>>
>> thank you
>>
>> Josimar
>>
>>
>>
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>>
>
>
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