[Gmsh] Meshing constraint in interphase section of RVEs

DILASSER Guillaume Guillaume.DILASSER at cea.fr
Fri Jan 3 15:46:54 CET 2020

Dear Mr. Rohracker,

If I understand correctly your issue, you want to generate meshes of disks with at least 4 elements along the radial direction, from the center to the edge of the disks. There are two ways you could use to control the mesh size inside the disk and enforce your constraint:

1.       The easiest method is to use a Point { id } In Surface { id } ; statement (explained here<http://gmsh.info/doc/texinfo/gmsh.html#Miscellaneous-mesh-commands> in the documentation). You can use this statement to insert the center point of the circle inside the mesh of the disk. If you set different mesh size for the center point and for the points on the disk edge, then you will have a radial gradient in mesh element sizes.

2.       If you want to have more control on the distribution of the mesh size, you might want to use fields (explained here<http://gmsh.info/doc/texinfo/gmsh.html#Specifying-mesh-element-sizes> in the documentation). Fields are more tricky to setup but I am more certain that they can help you to have always exactly 4 elements along the disk radius. Have a look at Gmsh tutorial n°10<http://gmsh.info/doc/texinfo/gmsh.html#t10_002egeo> for an example on how to setup fields.

Let me know if this helped or if you have other questions.

Sincerely Yours,

Guillaume Dilasser

-----Message d'origine-----
De : gmsh <gmsh-bounces at ace20.montefiore.ulg.ac.be> De la part de Rohracker, Maurice
Envoyé : vendredi 3 janvier 2020 14:52
À : gmsh at onelab.info
Objet : [Gmsh] Meshing constraint in interphase section of RVEs

Dear GMSH mail list members,

for a HiWi project at the University Erlangen-Nürnberg, I use GMSH for meshing representing volume elements (RVEs) with interphase sections.

For these interphase sections, we want at least 4 elements between the particles and the interphase.

For some elements, we get the right results because of small mesh size.

But for others not. Is there any possibility to get the right results without decreasing the mesh size of the circles?

I also tried to put an additional point between interphase and particle to specify here a kind of helping mesh size.

Is there also a possibility to have inside the circular elements larger mesh sizes, so that the mesh isn't that fine at all at the centre of each inclusion? (e.g. by specifying a larger mesh size at the centre?)

You find attached the current generated mesh.

Thank you very much in advance.

Best regards,

Maurice Rohracker

Master Student Computational Engineering FAU Erlangen-Nürnberg
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