<div dir="ltr">The Tesselate filter will linearize quadratic elements. We will check the issue with the quadratic triangle also.<div><br></div><div>-berk</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, May 22, 2014 at 9:50 AM, Andy Bauer <span dir="ltr"><<a href="mailto:andy.bauer@kitware.com" target="_blank">andy.bauer@kitware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div><div>Hi Andreas,<br><br></div>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.<br>
<br></div>Regards,<br>Andy<br></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, May 21, 2014 at 5:32 PM, Andreas Hessenthaler <span dir="ltr"><<a href="mailto:hessenthaler@mail.de" target="_blank">hessenthaler@mail.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Indeed, my smaller mesh had linear triangles. And changing that to quadratic triangles gives the same behavior (attachment).<br>
<p>What is the best way to circumvent this?</p>
<p>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.</p>
<p>Cheers</p>
<p><br> Am 21-May-2014 17:00:55 +0200 schrieb <a href="mailto:andy.bauer@kitware.com" target="_blank">andy.bauer@kitware.com</a>:</p>
<blockquote style="margin-left:0;padding-left:5px;border-left:2px solid navy">
<div dir="ltr">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?</div>
<div class="gmail_extra"><br><br>
<div class="gmail_quote">On Wed, May 21, 2014 at 9:51 AM, Andreas Hessenthaler wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Andy,<br>
<p>thanks for your quick reply. Please find the *.vtu file attached.</p>
<p>Cheers<br>Andreas</p>
<p> </p>
<p><br> Am 21-May-2014 15:24:30 +0200 schrieb <a href="mailto:andy.bauer@kitware.com" target="_blank">andy.bauer@kitware.com</a>:</p>
<blockquote style="margin-left:0;padding-left:5px;border-left:2px solid #000080">
<div dir="ltr">Can you share your data set? It will be difficult to diagnose without that.</div>
<div class="gmail_extra"><br><br>
<div class="gmail_quote">On Wed, May 21, 2014 at 9:06 AM, Andreas Hessenthaler wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi there,<br>
<p>I have the following problem:</p>
<p>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.</p>
<p>Though, when I do the same for a bigger domain, i.e. more elements (~80 000 nodes), I only get zero vorticity values.</p>
<p>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).</p>
<p>I can reproduce the behavior on different versions of ParaView: 3.14.1 & 4.1.0 as well as different operating systems: Windows 7 & Ubuntu 14.04.</p>
<p>If I calculate the gradient of the velocity field, all values are calculated as zero as well.</p>
<p>Thanks in advance!</p>
<p>Cheers<span style="color:#888888"><br>Andreas</span></p>
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