[Paraview] Vorticity is calculated as zero

[Andy Bauer]

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
<hessenthaler at mail.de>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 andy.bauer at kitware.com:
>
> 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 <
> hessenthaler at mail.de> 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
>>
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