RE: [Libmesh-users] I'm confused...

[KIRK, B. (JSC-E. (NASA) <ben...@na...>]

That means a face neighbor was not found in a case where a valid face
neighbor should exist.   The most likely cause of this problem is that in
the refinement process at some point a new node was created where a node
already existed.  Clearly, that shouldn't happen...  It effectively
introduces a slit in the domain because you have two elements that *should*
share an edge, but they don't.

I'll try and reproduce the error and find out exactly why it happened & what
can be done about it.

-Ben



-----Original Message-----
From: lib...@li...
[mailto:lib...@li...] On Behalf Of Ahmed
EL-Sheikh
Sent: Thursday, March 04, 2004 12:41 AM
To: lib...@li...
Cc: Ahmed El-Sheikh
Subject: [Libmesh-users] I'm confused...


Hi,

As I am playing around with libmesh, I tried to run ex10 but with a
different mesh the mesh was specified as a matlab output file with this
information

4 2
0.000000 0.000000
2.000000 0.000000
2.000000 2.000000
0.000000 2.000000
1 2 3 1
1 3 4 1

Then I did two changes in ex10.C

1- mesh_refinement.uniformly_refine (2);
    I chosen not to start with a coarse mesh to see what the error estimator
will do.
2- mesh_refinement.flag_elements_by_error_fraction (error,
         0.95,  // This is increased from 0.7
         0.07,
         5);

The I got the a run time error ....

Solving time step 26, time=0.6750...
  Refining the mesh...
I'm confused...
[0] src/mesh/mesh_base.C, line 528, compiled Mar  3 2004 at 21:54:19
make: *** [run] Aborted

So what is the problem with this check !!
Thanks in advance.

Ahmed


--
"No great thing is created suddenly." Epictetus
**************************************************
  Ahmed ElSheikh <els...@mc...>
  PhD Candidate, Department of Civil Engineering
  McMaster University
  1280 Main Street West
  Hamilton, Ontario,  L8S 4L7, Canada.

  Fax     : (905) 529-9688
  Cellular: (905) 920-9204
  Work    : (905) 525-9140 EXT. 22044

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