[Gmsh] Possible bugs with wrap filter

Christophe Geuzaine cgeuzaine at ulg.ac.be
Thu Jan 31 16:37:49 CET 2013


Hi Mohammed - Could you try with tomorrow's nightly build and let me know if it's better? I've changed the plugin slightly to use adaptive data if it's available.

Christophe

On 18 Dec 2012, at 12:29, Mohamed Moussa <mohamed.moussa89 at gmail.com> wrote:

> Hey,
> 
> Firstly let me describe my goal. I have a model with beam elements
> (4-node line elements) that have displacement and stress views. The
> stress views are scalars, not tensors.
> 
> I would like to view these stress views on the displaced model. I
> thought I could use 'General Transformation Expressions' on the stress
> view (using my displacement view as the data source), but this
> produces very strange results when I also tick 'Adapt Visualization
> Grid' (I want to see the curved shape of the element). These two
> options do not work together.
> 
> So I had another idea where I would use the 'wrap' filter directly on
> the stress view, using the displacement view as the source. This
> doesn't look as strange with 'Adapt Visualization Grid' enabled, but
> it still is clearly incorrect. I think what the 'wrap' filter is doing
> is that it is only transforming the first 2 nodes of the four-node
> element, and not the two inner nodes. This mean the interpolation is
> done incorrectly.
> 
> Is this a known bug, and are there any other alternatives I could try?
> 
> Regards,
> 
> Mohamed
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine







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