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<p style="margin-top:0;margin-bottom:0">Dear Alexis,</p>
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<p style="margin-top:0;margin-bottom:0">The ext_cyl demo was an early example of start-to-finish meshing for</p>
<p style="margin-top:0;margin-bottom:0">flow past a cylinder.</p>
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<p style="margin-top:0;margin-bottom:0">It's certainly not the case that it is optimized---users have many options for</p>
<p style="margin-top:0;margin-bottom:0">building meshes that are optimized for their particular flow conditions as</p>
<p style="margin-top:0;margin-bottom:0">the elements may be connected in any unstructured way.</p>
<p style="margin-top:0;margin-bottom:0"><br>
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<p style="margin-top:0;margin-bottom:0">We also have new mesh smoothing tools and a nonconforming overlapping</p>
<p style="margin-top:0;margin-bottom:0">domain capability that would allow for a fine mesh in the cylinder and cylinder</p>
<p style="margin-top:0;margin-bottom:0">wake with a relatively coarse mesh in the far field.</p>
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<p style="margin-top:0;margin-bottom:0">hth,</p>
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<p style="margin-top:0;margin-bottom:0">Paul</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nek5000-users <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of nek5000-users@lists.mcs.anl.gov <nek5000-users@lists.mcs.anl.gov><br>
<b>Sent:</b> Tuesday, May 22, 2018 2:21:32 AM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] Mesh optimisation for the cylinder case ext_cyl</font>
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Dear Nek5000 masters,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">I have been able to run the ext_cyl example. And, after postprocessing the case, it made me wonder if Nek5000 is able to run this case with a more optimized mesh? That is, refined just close to the cylinder
and coarse away from it.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Clearly, for this case, the refinement around the cylinder extends in sort of a + shape away from the cylinder. This refinement away from the cylinder is not necessary, specially towards the sides and
towards the upstream. But even in the downstream the mesh could be (ideally) a bit coarser.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Some other CFD codes are able to handle this problem by accepting refinement of the mesh just close to the cylinder (obviously at the surface of the refinement an element from the coarser side becomes neighbour
of two or more elements on the refined side). Im wondering if Nek5000 is already capable of handling this kind of refinement (or possibly any other solution/trick {maybe lowering the order of the elements themselves}) in order to avoid this typical problem
of excessive refinement where its not needed/desired?</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Wondering and hoping, indeed, because this problem may become serious for some other configurations, for example for an array of cylinders, which then my cause the mesh to be refined all over the domain
and not just in the + shape region.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Thanks a lot,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Alexis</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Dr Alexis Espinosa</span></b><span style="font-size:11.0pt"></span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Supercomputing Specialist</span></b><span style="font-size:11.0pt"></span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Pawsey Supercomputing Centre</span></b><span style="font-size:11.0pt"></span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">26 Dick Perry Ave</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Kensington WA 6151</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Australia</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Tel</span></b><span style="font-size:11.0pt"> +61 xxxx xxxx</span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Email</span></b><span style="font-size:11.0pt">
<a href="mailto:alexis.espinosa@pawsey.org.au">alexis.espinosa@pawsey.org.au</a></span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Web</span></b><span style="font-size:11.0pt">
<a href="http://www.pawsey.org.au/">www.pawsey.org.au</a></span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"><img border="0" width="230" height="59" id="x__x0000_i1026" src="cid:image001.png@01D3F1E0.9083C740"></span><span style="font-size:11.0pt"></span></p>
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<p class="x_MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Alexis Espinosa Gayosso <alexis.espinosa@pawsey.org.au><br>
<b>Date: </b>Tuesday, 8 May 2018 at 4:46 pm<br>
<b>To: </b><nek5000-users@lists.mcs.anl.gov><br>
<b>Subject: </b>Compiling Problems in "Running your very first simulation"</span><span style="color:black"></span></p>
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<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Hello,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">The title of my thread is the same as for an already existing thread (26-Sept-2017) because:</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">I receive very similar warning messages when compiling nek5000 (./maketools all). Lots of warnings!</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">From your answer on that thread it seems that you do not worry at all for the warning messages. Should we really not care about them? How to know which warnings are not of concern and which other are? Can
you post your own .log file to see which warning messages are considered normal for you? Or how do you check everything went fine for the compilation?</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Anyway, I will start running the examples in order to learn about the usage of the code. And I guess any abnormality would appear there.</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Many thanks,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Alexis</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Dr Alexis Espinosa</span></b></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Supercomputing Specialist</span></b></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Pawsey Supercomputing Centre</span></b></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">26 Dick Perry Ave</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Kensington WA 6151</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Australia</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Tel</span></b><span style="font-size:11.0pt"> +61 xxxx xxxx</span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Email</span></b><span style="font-size:11.0pt">
<a href="mailto:alexis.espinosa@pawsey.org.au">alexis.espinosa@pawsey.org.au</a></span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">Web</span></b><span style="font-size:11.0pt">
<a href="http://www.pawsey.org.au/">www.pawsey.org.au</a></span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"><img border="0" width="230" height="59" id="x__x0000_i1025" src="cid:image002.png@01D3F1E0.9083C740"></span></p>
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