It looks like these are quadratic triangles. I'm not sure that the compute derivatives filter works with that type of cell. Did your smaller grid also have quadratic cell types?
On Wed, May 21, 2014 at 9:51 AM, Andreas Hessenthaler <[email protected]>wrote: > Hi Andy, > > thanks for your quick reply. Please find the *.vtu file attached. > > Cheers > Andreas > > > > > Am 21-May-2014 15:24:30 +0200 schrieb [email protected]: > > Can you share your data set? It will be difficult to diagnose without that. > > > On Wed, May 21, 2014 at 9:06 AM, Andreas Hessenthaler < > [email protected]> wrote: > >> Hi there, >> >> I have the following problem: >> >> When I calculate the vorticity through Filters > Compute Derivatives > >> Vorticity for a simple example (driven cavity in 2D) with only few elements >> on an unstructured grid I get the correct values. >> >> Though, when I do the same for a bigger domain, i.e. more elements (~80 >> 000 nodes), I only get zero vorticity values. >> >> The grids and values are all read in from *.vtu files, with the exact >> same format, meshes are triangluar 2D (z-components set to 0.0). >> >> I can reproduce the behavior on different versions of ParaView: 3.14.1 & >> 4.1.0 as well as different operating systems: Windows 7 & Ubuntu 14.04. >> >> If I calculate the gradient of the velocity field, all values are >> calculated as zero as well. >> >> Thanks in advance! >> >> Cheers >> Andreas >> >> _______________________________________________ >> Powered by www.kitware.com >> >> Visit other Kitware open-source projects at >> http://www.kitware.com/opensource/opensource.html >> >> Please keep messages on-topic and check the ParaView Wiki at: >> http://paraview.org/Wiki/ParaView >> >> Follow this link to subscribe/unsubscribe: >> http://www.paraview.org/mailman/listinfo/paraview >> >>
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