[Paraview] Gradient of 2D velocity field with paraview

[Eleonora Piersanti]

Thank you so much! It seems to really work! :)Just out of curiosity, what Extract surface filter does? Since velocity is approximated with quadratic elements, do I loose accouracy using Extract surface filter?  Kind regards,Eleonora


     Il Venerdì 30 Gennaio 2015 11:48, Andy Bauer <andy.bauer at kitware.com> ha scritto:
   

 It looks like the Gradient of Unstructured Data Set filter isn't working properly with quadratic triangles. Try using the Extract Surface filter before computing gradients to convert them into linear triangles.

If you want to get more familiar with using ParaView, the ParaView tutorial at http://www.paraview.org/Wiki/The_ParaView_Tutorial is a good place to start.

Regards,
Andy

On Fri, Jan 30, 2015 at 6:25 AM, Eleonora Piersanti <eleonorapiersanti at yahoo.it> wrote:

 Thank you for the answer.I think that the dimension of the .vtk file was too big. You can download the .vtk file from:
https://www.dropbox.com/s/o1wjo2brsaeu5ag/stability_realEigU_up0.vtk.tar.gz?dl=0

In which sense should I use the Slice filter? Sorry but I am quite new with paraview.Kind regards,Eleonora       Il Venerdì 30 Gennaio 2015 11:16, Eleonora Piersanti <eleonorapiersanti at yahoo.it> ha scritto:
   

 Thank you, for the answer.I attach the .vtk file. In which sense should I use the Slice filter? Sorry but I am quite new with paraview.Kind regards,Eleonora 

     Il Venerdì 30 Gennaio 2015 10:59, Andy Bauer <andy.bauer at kitware.com> ha scritto:
   

 Your description is a bit vague to diagnose the issue. Can you share your data set? I was able to use the Wavelet source, use the Slice filter and then use the Gradient of Unstructured Data Set without any issues. Can you see if that works for you?

Regards,
Andy

On Fri, Jan 30, 2015 at 5:26 AM, Eleonora Piersanti <eleonorapiersanti at yahoo.it> wrote:

Hi to everyone!I computed with finite elements a 2D velocity field. I plotted without any problem the velocity field with paraview. I would like to compute the gradient. 
I tried Filters->Gradient of Unstructured Data Set but without succes.Can you help me?Thanks, 
Nora

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