[Gmsh] Prescribed mesh size at vertices - strange treatment

Simone GREMMO [531257] Simone.GREMMO at umons.ac.be
Mon Mar 23 21:40:31 CET 2015


Hello,
I have a question about the way the prescribed mesh size is imposed when meshing an edge: in function LC_MVertex_PNTS(GEntity *ge, double U, double V) in file ./Mesh/BackgroundMesh.cpp that is used to set l2 (the characteristic length from points), it is said that if prescribed mesh size at the edge extremities is GREATER than 1e22, then lc=referenceLength / 10; where the referenceLength is the diagonal of the domain bounding box.

In the sources there is already a FIXME note (// FIXME we might want to remove this to make all lc treatment consistent), but I would like to understand from where this arbitrary size comes from. How to ensure that the results is always the expected one?
I would not expect that the resulting mesh depends on the domain bounding-box size, or that using 1e22 or 1e21 influences the result .

Thanks for your explanations,

Regards,
Simone
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