Sear Walter,
Indeed, good idea. This has been merged, but with a different implementation
for the Netgen interface, directly calling the overall mesh size evaluation.
Let me know if it behaves as expected.
Christophe
> On 20 Sep 2020, at 17:37, walter steffe <walter.steffe...@gmail.com> wrote:
>
> In order to better support my application (see
> hierarchical-electromagnetics.com) I made the following small changes to gmsh
> sources (version 4.6.0):
>
> 1) File GRegion.h : Added a "double meshSize" field into the
> "GRegion:meshAttributes"
>
> class GRegion : public GEntity {
> ........
> struct { ......
> double meshSize;
> } meshAttributes;
> ...
> }
>
>
> 2) File GRegion.cpp: added "meshAttributes.meshSize = MAX_LC;" into the
> function "void GRegion::resetMeshAttributes()"
>
> void GRegion::resetMeshAttributes()
> {
> ...
> meshAttributes.QuadTri = NO_QUADTRI;
> meshAttributes.meshSize = MAX_LC;
> }
>
> 3) File meshGRegionNetgen.cpp: changed following lines:
>
> line 320:
> -- Ng_GenerateVolumeMesh(ngmesh, CTX::instance()->mesh.lcMax);
> ++ Ng_GenerateVolumeMesh(ngmesh, std::min(gr->meshAttributes.meshSize,
> CTX::instance()->mesh.lcMax));
> line 345:
> -- Ng_OptimizeVolumeMesh(ngmesh, CTX::instance()->mesh.lcMax);
> ++ Ng_GenerateVolumeMesh(ngmesh, std::min(gr->meshAttributes.meshSize,
> CTX::instance()->mesh.lcMax));
>
>
>
>
> I would like to ask, if possible, to accept these changes in the official
> gmsh sources.
>
> The motivation is that, in an electromagnetic simulation, the mesh size need
> to be more refined in regions where the dielectric permittivity is high.
> The mesh refinemnet applied on the boundary of these regions may not be
> sufficient because the mesh size of tetrahedrons which are distant from the
> boundary is
> defined by the global lcMax.
>
>
> Thanks
> Walter
>
>
>
>
>
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—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
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