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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;"><font size="2"><span style="font-size:10pt">Dear all GMSH users,<br>
<br>
I am writing you because I have found an issue running the CURL plugin.<br>
In order to show you the problem I discovered, I have enclosed a picture in the email.
<br>
I noticed that if I don't optimize a 3D mesh (left column in the picture) I have almost the same calculated field for each node as if I optimize the mesh (right column in the picture). The calculated</span></font><font size="2"><span style="font-size:10pt">
f</span></font><font size="2"><span style="font-size:10pt">ield is just a mathematical combination of the geometrical position of the points (for example, for one point the X component of the field is the sum of the geometrical position on the Y and Z axis
of that point).<br>
Then, if I do the CURL of the field calculated on each node I have a corrected shape if the mesh was previously optimized (right part in the figure). If the mesh was instead not optimized (left part in the picture) I have some spikes that compromise the result
although the other arrows are correctly oriented.<br>
<br>
At this point I was wondering if there is a problem on the curl plugin or if I should always optimize a mesh using optimize3D and Netgen optimization in order to have reliable results while running nabla operations.<br>
If it is so, why optimization is so important before running nabla operations like the curl?<br>
<br>
I thank you for your time in advance.<br>
<br>
Best regards,<br>
Stefano</span></font>
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<br>
Stefano Mandija M.Sc.|PhD Student|Imaging Division|University Medical Center Utrecht<br>
Heidelberglaan 100|3584 CX Utrecht|The Netherlands|Visiting address: Q04.4.302|Tel.: +31 88 7569649</div>
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