[Paraview] Paraview v 3.14, GradientOfUnstructuredDataSet1, vorticity

[Moreland, Kenneth]

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.

In contrast, when you take the gradient of a scalar, you get a vector,
which is understood by and leveraged by many filters.

-Ken



On 6/6/12 9:04 AM, "Ricardo Reis" <rreis at aero.ist.utl.pt> wrote:

>
>  When using the filter
>
>  GradientOfUnstructuredDataSet1
>
>  and selecting Vorticity, this result doesn't become available. On the
>other hand Q Criterion becomes available under the right moniker...
>
>  Is this expected?
>
>  best,
>
>  Ricardo Reis
>
>  --
>
>  PhD/MSc Mechanical Engineering | Lic. Aerospace Engineering
>
>  Computational Fluid Dynamics, High Performance Computing, Turbulence
>  http://www.lasef.ist.utl.pt
>
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>
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>
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