[Paraview] Vorticity is calculated as zero

[Andreas Hessenthaler]

Dear all,

thank you for the quick replies and many different suggestions! 

All the different tools work and I think the Surface LCI plugin is a nice solution (and much quicker to visualize than streamlines!). 

Cheers
Andreas 

 Am 22-May-2014 16:04:52 +0200 schrieb berk.geveci at kitware.com: 
 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  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 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 ">
Andreas 
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