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This looks like something that could be done by combining for example `YASPGrid` with `GeometryGrid` - although perhaps `GeometryGrid` might have to be changed a bit to not linearize the `Geometry` , so it might not work out of the box....
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Dune <dune-bounces@lists.dune-project.org> on behalf of Timo Koch <timo.koch@iws.uni-stuttgart.de><br>
<b>Sent:</b> 15 May 2020 11:01<br>
<b>To:</b> dune@lists.dune-project.org <dune@lists.dune-project.org><br>
<b>Cc:</b> Goncalves Machado, C. (Cintia) <cintia.machado@tno.nl><br>
<b>Subject:</b> Re: [Dune] Radial grid in Dune (curvilinear grids)</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Dear Cintia,
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<div class="">there is an implementation in Dumux:</div>
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<div class="">* <a href="https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/tree/master/examples/1protationsymmetry" class="">https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/tree/master/examples%2F1protationsymmetry</a></div>
<div class="">* <a href="https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/blob/master/dumux/discretization/rotationsymmetricgridgeometrytraits.hh" class="">https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/blob/master/dumux/discretization/rotationsymmetricgridgeometrytraits.hh</a></div>
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<div class="">However the implementation is based on the additional finite volume abstraction of Dumux with (sub)control-volumes and (sub)control-volume-faces.</div>
<div class="">Volumes and faces are “extruded” by rotational extrusion based on Guldinus theorem.</div>
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<div class="">But maybe it helps at least how you could easily achieve this.</div>
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<div class="">Timo</div>
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Timo Koch                                      phone: +49 711 685 64676<br class="">
IWS, Universität Stuttgart                  fax:   +49 711 685 60430<br class="">
Pfaffenwaldring 61         <a href="mailto:timo.koch@iws.uni-stuttgart.de" class="">
email: timo.koch@iws.uni-stuttgart.de</a><br class="">
D-70569 Stuttgart             url: <a href="http://www.iws.uni-stuttgart.de/en/lh2/" class="">www.iws.uni-stuttgart.de/en/lh2/</a><br class="">
_________________________________________________</div>
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<div class="">On 15. May 2020, at 11:43, Goncalves Machado, C. (Cintia) <<a href="mailto:cintia.machado@tno.nl" class="">cintia.machado@tno.nl</a>> wrote:</div>
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<span lang="EN-US" class="" style="color:rgb(32,56,100); background-color:white; background-position:initial initial; background-repeat:initial initial">Dear Dune developers and users,</span></div>
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<span lang="EN-US" class="" style="color:rgb(32,56,100); background-color:white; background-position:initial initial; background-repeat:initial initial">I am working on implemeningt radial grid in OPM-flow and would like to ask  if someone has implemented radial
 grids with cells similar to this:</span></div>
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<span lang="EN-US" class="" style="color:rgb(32,56,100); background-color:white; background-position:initial initial; background-repeat:initial initial">Best regards,</span></div>
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<span lang="EN-US" class="" style="font-size:8pt; font-family:Arial,sans-serif">Cíntia Gonçalves Machado, PhD<br class="">
Reservoir Engineering Scientist<span class="x_Apple-converted-space"> </span><br class="">
Applied Geosciences</span><span lang="EN-US" class="" style="color:rgb(31,56,100)"></span></div>
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M +31 (0) 627144707<br class="">
E </span><span class="" style="font-size:8pt; font-family:Arial,sans-serif"><a href="mailto:cintia.machado@tno.nl" class="" style="color:rgb(149,79,114); text-decoration:underline"><span lang="EN-US" class="" style="color:rgb(87,149,195); text-decoration:none">cintia.machado@tno.nl</span></a></span><span lang="EN-US" class="" style="color:rgb(31,56,100)"></span></div>
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</span><span class="" style="font-size:8pt; font-family:Arial,sans-serif">Utrecht, The Netherlands</span></div>
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