[Paraview] Computation of gradients fails

[Moreland, Kenneth]

More information please.

How are you extracting the x-component of the velocity?  What filter are you running to compute the gradient?  Would it be possible to post some example data that exhibits the problem so that we can replicate it?

-Ken


On 9/22/10 7:12 AM, "Martin Vymazal" <martin.vymazal at vki.ac.be> wrote:

Dear ParaView developers,

  I'm trying to compute gradient of my x-component of velocity on a
grid of tetrahedra which has 55244 DOF. ParaView fails to compute the
gradients with the following error message:

Generic Warning: In
/home/kitware/Dashboard/MyTests/ParaView-3-8/ParaView-3.8/ParaView/VTK/Common/vtkMath.cxx, line
1338
Unable to factor linear system

The mesh does not have degenerate/ugly elements, but it has some sharp
edges (in the inlet/outlet area). Is this a problem? If not, is there
a way of avoiding the error?

Thank you very much.

  Martin Vymazal

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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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