[CIG-SHORT] the error 'Number of dofs in reference cell (3) is not compatible with number of edges (4) in cohesive 93720 for fault 'fault'

[Brad Aagaard]

On 6/22/14, 7:13 AM, Matthew Knepley wrote:
> On Sun, Jun 22, 2014 at 5:55 AM, LMD <lmdofls at 126.com
> <mailto:lmdofls at 126.com>> wrote:
>
>     Hi Brand and Charles:
>          When i tried to set up a 3d subduction model, the error 'Number
>     of dofs in reference cell (3) is not compatible with number of edges
>     (4) in cohesive 93720 for fault 'fault' 'always occurred. Different
>     methods have been tried to specify slip/velocity to the fault,  but
>     they were useless.  I meshed the geometry with Cubit, the commands i
>     used as following: volume all size 3000; mesh volume all.  Would you
>     give me a hand? Thanks a lot.
>
>
> What this says is that there are 4 edges across in one of your cohesive
> cells, so something is definitely wrong in the mesh. I would
> advise making a much smaller problem so that you can easily see all the
> cells, and then scale up.

It looks like you are using quadrature for tet cells with a hex mesh. 
The number of edges in the reference cell (from quadrature) is 3 while 
the cell in the mesh has 4 edges. You need to change the quadrature 
settings. See examples/3d/hex8 for how to setup the quadrature for a hex 
mesh.

Regards,
Brad