[Gmsh] anisotropic 2D mesh at face boundary

[Steffè Walter]

Hello,

 

 I am using gmsh trough API provided by gmshlib.a in order to mesh a collection of OCC surfaces imported from a CAD.

 

 The meshing works fine and I have tried several 2D algorithms (front2d, meshadapt, bds, del2d, bamg) which I have seen can be specified

 in the string argument of GmshInitialize(argc, argv).

 

I would like to increase the mesh density inside the face with respect to the size of the contour elements (defined 

in the previous mesh(1)). Is it possible to specify a mesh size that is related to the specific face and is smaller than length of contour edges.

Ideally I would like to have a situation where the peripheral triangles are somewhat anisotrope (compressed in the direction normal to the contour).

I think it should be possible to get this effect by selecting the face related mesh size smaller than contour related mesh size. The ratio should be in the range

0.5 < R <1 where the lower limit should be avoided because it would produce degenerate flat triangles.

 

>From a slightly different point of view  I would like to have a sort of 1dimensional boundary layer coomposed of thin triangles.

Is it possible to get this result in some way by a proper choice of algo2d and of the related parameters ?

 

 

Thanks

Walter

 

 

 

 

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