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Dear George,<br>
<br>
You can also use the "Fast Curving" algorithm in the "High order
tools" after converting your 3D mesh to high order. It is still
work-in-progress and not guaranteed to work, specially for order
> 2, but for the case you sent, it corrects the invalid 2nd-order
3D mesh in less than 2 seconds.<br>
<br>
Best regards,<br>
<br>
Thomas<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/13/2013 02:14 PM, Jean-François
Remacle wrote:<br>
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<div>Le 11 déc. 2013 à 11:53, George Ntemos <<a
moz-do-not-send="true"
href="mailto:george.ntemos11@imperial.ac.uk">george.ntemos11@imperial.ac.uk</a>>
a écrit :</div>
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<p style="margin-bottom: 0cm">Dear Gmsh Development Team,<br>
<br>
<br>
My name is George Ntemos and I am a PhD student in the
Aeronautics Department of Imperial College London. Our
team is developing and applying CFD software, using gmsh
for high-order meshing purposes.</p>
<p style="margin-bottom: 0cm">I am currently studying a flow
case around a rod-aerofoil set-up and I've been
experiencing some problems with high-order meshing. More
specifically, the meshing algorithm fails to mesh in high
order around the (spline-defined) aerofoil profile. Please
find attached a lightweight .geo file of my configuration
just for demonstration purposes. If one tries meshing this
file in 3d and for order > 1, gmsh will warn that, to
my understanding, the algorithm fails to properly converge
at certain points, visibly resulting in quite severe
discrepancies for a few elements (curvilinear on). It also
warns that it cannot orient the normal for the two
extruded surfaces of the rod (cylinder) boundary layer. It
is worth noting here that I am experiencing none of the
above problems when I am meshing in 2d. Since my 3d mesh
is just a simple extrusion, I would assume that extending
to 3d is just a trivial case of translating every
operation along the 3<sup>rd</sup> dimension. I am of
course not particularly experienced in using gm</p>
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<div><br>
</div>
<div>The 2D mesh is already wrong as is. If you use the high
order tools with the current parameters, this</div>
<div>is what it gives : </div>
<div><br>
</div>
<div>
<div>Info : --- Optimization pass with initial jac. range
(-0.528961, 1.76584), jacBar = -0.581857</div>
<div>Info : Reached jacobian (0.148494 1.77654)
requirements, setting null gradient</div>
<div>Info : Optimization finalized after 11 iterations (41
function evaluations),</div>
<div>Info : because gradient norm is no more than EpsG</div>
<div>Info : Optimization done Range (0.148494,1.77654)</div>
<div>Info : Optimization succeeded</div>
<div>Info : Done optimizing high order mesh (278.816 s)</div>
<div><br>
</div>
</div>
<div>It is quite long indeed (work clearly in progress for
boundary layers) but it worked !</div>
<div><br>
</div>
<div>JF</div>
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<p style="margin-bottom: 0cm">sh however and I may very well
be missing something here.</p>
<p style="margin-bottom: 0cm">Any help regarding these
issues would be greatly appreciated.</p>
<p style="margin-bottom: 0cm">Thank you for your time.</p>
<p style="margin-bottom: 0cm"><br>
</p>
<p style="margin-bottom: 0cm">Best regards,</p>
<p style="margin-bottom: 0cm">George</p>
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<div>------------------------------------------------------------------</div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Prof. Jean-Francois Remacle</span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Universite catholique de Louvain
(UCL)</span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Ecole Polytechnique de Louvain (EPL)
- Louvain School of Engineering</span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Institute of Mechanics, Materials
and Civil Engineering (iMMC)</span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Center for Systems Engineering and
Applied Mechanics (CESAME)</span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
12px; ">Tel : +32-10-472352 -- Mobile :
+32-473-909930 </span></font></div>
<div><font class="Apple-style-span" size="3"><span
class="Apple-style-span" style="font-size:
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<pre class="moz-signature" cols="72">--
Thomas Toulorge
Université catholique de Louvain (UCL)
Institute of Mechanics, Materials and Civil Engineering (iMMC)
Applied Mechanics and Mathematics Division (MEMA)
Avenue George Lemaître 4-6 bte L4.05.02
1348 Louvain-la-Neuve, BELGIUM
Tel.: +32 10 47 23 54
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