[Paraview] Vorticity is calculated as zero

[Berk Geveci]

The Tesselate filter will linearize quadratic elements. We will check the
issue with the quadratic triangle also.

-berk


On Thu, May 22, 2014 at 9:50 AM, Andy Bauer <andy.bauer at kitware.com> wrote:

> Hi Andreas,
>
> The best way I can think of to get this working in ParaView is to use the
> programmable filter to convert to linear triangles. You can also subdivide
> the triangles if you want to maintain your higher order accuracy.
>
> Regards,
> Andy
>
>
> On Wed, May 21, 2014 at 5:32 PM, Andreas Hessenthaler <
> hessenthaler at mail.de> wrote:
>
>> Indeed, my smaller mesh had linear triangles. And changing that to
>> quadratic triangles gives the same behavior (attachment).
>>
>> What is the best way to circumvent this?
>>
>> The reason why I wanna use the vorticity function is the following:
>> eddies appear all over the domain and using lines with the streamtracer
>> filter gives regions with either no streamlines or regions that are very
>> much crowded by streamlines. Therefore, having a vorticity field would be a
>> suitable approach to have a nice and clean visualization of the flow field.
>>
>> Cheers
>>
>>
>> Am 21-May-2014 17:00:55 +0200 schrieb andy.bauer at kitware.com:
>>
>> 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 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 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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>
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