[Gmsh] Size fields question

[Jean-François Remacle]

Hello,

Just put
Mesh.CharacteristicLengthExtendFromBoundary = 0;

in the geo file.

JF


Le 21 nov. 2014 à 03:34, Grégory LEGRAIN <gregory.legrain at ec-nantes.fr> a écrit :

> Dear gmsh developers/users,
> I am playing with size fields, and I experienced some strange results...
> 
> Consider the folllwing geo file :
> lc = 1.e-2;
> 
> Point(1) = {0.0,0.0,0.0,lc};
> Point(2) = {1,0.0,0.0,lc};
> Point(3) = {1,1,0.0,lc};
> Point(4) = {0,1,0.0,lc};
> Line(1) = {4,3};
> Line(2) = {3,2};
> Line(3) = {2,1};
> Line(4) = {1,4};
> Line Loop(5) = {2,3,4,1};
> Plane Surface(6) = {5};
> 
> 
> Field[1] = MathEval;
> Field[1].F = "0.1";
> Background Field = 1;
> 
> As you can see, I should get a mesh with elements of size 0.1.
> 
> Unfortunately, I obtain a mesh with size 1.e-2 which was my initial characteristic length (see isoKO.png). Now, if I set lc=1. I get a correct mesh (see isoOK.png).
> 
> So my question is : did I miss something ? Is it normal that the size field is only taken into account when it is smaller than the initial characteristic length ? (i.e. no coarsening possible)
> 
> Best regards,
> Gregory
> 
> PS : I played also with anisotropic meshing, and in this case the metric is taken into account everywhere except on the boundaries.
> 
> -- 
> -------------------------------
> Grégory LEGRAIN
> Maître de Conférences - Assistant Professor
> Responsable de l'option Modélisation et Simulation Mécanique (MSM)
> GeM Institut de Recherche en Génie Civil et Mécanique - UMR CNRS 6183
> Equipe structure et simulation
> 
> Ecole Centrale de Nantes
> 1 Rue de la Noe, 44321 Nantes, France
> Email : gregory.legrain at ec-nantes.fr
> Tel : 02.40.37.16.41.
> Fax : 02.40.37.25.73.
> 
> <isoOK.png><isoKO.png>_______________________________________________
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Professor Jean-François Remacle
Department of Computational and Applied Mathematics
Rice University

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