[Paraview] Paraview v 3.14, GradientOfUnstructuredDataSet1, vorticity

[Andy Bauer]

Hi,

This filter is a bit confusing to use (along with being poorly named since
it works with image data, rectilinear grids, etc.). When you choose the
Vorticity it returns the vorticity instead of the gradient field. When you
select Q criterion it returns q criterion in addition to the other gradient
quantity. It's on my radar to clean this up but I haven't gotten around to
it yet.

Andy

On Wed, Jun 6, 2012 at 12:02 PM, Ricardo Reis <rreis at aero.ist.utl.pt> wrote:

> On Wed, 6 Jun 2012, Moreland, Kenneth wrote:
>
>  I am guessing that Vorticity in your dataset is a 3D vector (which is
>> typical) and that Q Criterion is a scalar.
>>
>> When you take the gradient of a vector, you get a 3x3 tensor (an estimate
>> of the Jacobian matrix, I believe).  These 9-tuples are not as widely
>> recognized in ParaView/VTK filters as scalars and vectors so they will not
>> be listed in selection combo boxes for inputs.  You should still see the
>> entry listed in the Information panel, though.
>>
>
> This filter, besides calculating the gradient, gives me the option to also
> calculate
>
>  Compute Vorticity
>  Compute QCriterion
>
> I'm starting from a velocity vector field. I would expect to obtain, after
> the filter and selecting all options:
>
>  - a gradient (here it gives only 3 main directions)
>  - a vorticity vector field
>  - a scalar field with QCriterion
>
>  Of these, the vorticity field is absent, even in the information panel.
>
>
>  best,
>
>  Ricardo Reis
>
>  --
>
>  PhD/MSc Mechanical Engineering | Lic. Aerospace Engineering
>
>  Computational Fluid Dynamics, High Performance Computing, Turbulence
>  http://www.lasef.ist.utl.pt
>
>  Cultural Instigator @ Rádio Zero
>  http://www.radiozero.pt
>
>  http://www.flickr.com/photos/**rreis/<http://www.flickr.com/photos/rreis/>
>
>  contacts:  gtalk: kyriusan at gmail.com  skype: kyriusan
>
>  Institutional Address:
>
>  Ricardo J.N. dos Reis
>  IDMEC, Instituto Superior Técnico, Technical University of Lisbon
>  Av. Rovisco Pais
>  1049-001 Lisboa
>  Portugal
>
>                      - email sent with alpine 2.00 -
>
> _______________________________________________
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.paraview.org/pipermail/paraview/attachments/20120606/0f837d6a/attachment.htm>