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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