[CIG-SHORT] [EXTERNAL] Re: defining fault_edge nodes

[Brad Aagaard]

On 6/21/18 5:50 PM, Niloufar Abolfathian wrote:
> Thanks, Brad. By my second question, I mean in cases where the fault is 
> extended to the external boundaries, and we want to set boundary 
> conditions on these surfaces(external boundaries), fault nodes should be 
> all excluded. Is this statement right?

Yes, that is correct.


> 
> 
> On Thu, Jun 21, 2018 at 5:40 PM, Brad Aagaard <baagaard at usgs.gov 
> <mailto:baagaard at usgs.gov>> wrote:
> 
>     On 6/21/18 12:38 PM, Niloufar Abolfathian wrote:
> 
>         Hi,
> 
>         I am modeling a 3D vertical fault in an upper crust, lying on a
>         lower crust. It is as your 3d/hex example instead of that the
>         fault is only located in the upper crust.  I set up the nodes
>         related to the fault and fault_edge. From my meshing and node
>         selection the fault should only be located in the upper crust,
>         but after running the model the fault is extended below the
>         upper crust. I guess it may be due to the selection of fault and
>         fault_edge nodes. Hope you can help me with this issue.
> 
>         Question: Should the fault_edge nodes be also included in fault
>         nodes? (I suppose the answer is yes, due to the figure 6.4 in
>         the manual.)
>         I tried excluding fault_edge nodes from the fault but then the
>         model will not be converged.
> 
> 
>     Yes. The fault edge nodes are included in the fault nodes.
> 
>     The edge nodes are any buried edges of the fault. That is, any nodes
>     on edges that are not on the external domain boundary should be
>     included in the fault edges.
> 
>         I have another question. In the example 3d/hex model, if we want
>         to define a boundary condition on y_neg/y_pos , the fault nodes
>         be excluded az z_neg, right?
> 
> 
>     I don't understand this question.
> 
>     Regards,
>     Brad
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>