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Gmsh 3.0 - Boundary layer 3D mesh

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Old   April 14, 2018, 04:50
Default Gmsh 3.0 - Boundary layer 3D mesh
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Paul Bertrand
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Dear all,
I just begin to use Gmsh and I have some problems with the last version. I searched some solutions on forums or in the documentation but I still have some problems :

I am trying to use Gmsh to mesh 3D models by taking into account the boundary layer.

My 3D model is from a .STP file and I tried to use the GUI to generate meshes.
I have no problems to generate 3D meshes which are well exported to OpenFoam.

Now, I want ton add some prisms layers at walls to take into account the boundary layer.
I followed all the information that I've found on forums or documentation but it seems that nothing happens when I use
Mesh -> Define -> Size Fields -> New -> Boundary Layer (with the GUI).

I have no errors in the dialog window below, but I have no changes in the mesh...

I think the reason is that I don't fill the fields with good information, especially about EdgesList and NodesList ??
I try to apply layers of prisms on surfaces (as I have a 3D model...) and I am not sure what is expected in these fields (and what is the format (1, 2, ... ?). I have noticed the values of each surface but I don't know how to input them in the fields...

My questions :
- Is there a good tutorial for Gmsh and is there a method described with tutorials or examples about how to do these kinds of meshing or operations ?
- How can I input the expected informations about faces selected, ... in the Boundary Layer window fields (format, ...) ?

Thank you very much in advance for your help and answers,
Best regards,
Paul
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Old   April 17, 2018, 05:30
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Paul Bertrand
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Hello,

It is not the solution that I hoped but I think it's the right solution (?) :
If someone is interested, I will post a more detailled message but I finally used Engrid with a surface mesh from Gmsh (file .msh).
Engrid is very efficient and allows to create a prismatic boundary layer easily, almost as easily as for commercial software.

I will try to improve the method and I will come back to detail it...

But if someone has other method based on Gmsh, I am still interested...
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Old   April 19, 2018, 17:16
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Alberto Pizarro
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Hi
Boundary Layer Field only works with 2D grids. You have to use 'extrude' commands for 3D problems.

Regards
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