Structured mesh

ing515

Hello
what is the best approach/workflow to make a structured mesh along holes?
This question because I want to replicate the following plate


I've already tried with automatic mesh & points refinement, what I got is here

Then I found the command "Plate mesh" that allows to create a square with circular hole in a structured mesh

So I modified the cad geometry, I put squares boundary edges for the both holes

and the genereted the automatic mesh

I made the plate mesh with the command and moved where I needed

The nodes along the edges are not connected and even with the "merge" command I got disconnected holes


I expected to get something like this


do you have any suggestions?
Thank you

Fatmac

Rhino has a great function called quadremesh -for 2d meshes like this it works nicely

ing515

Thanks for the reply, it's an exceptional result but, not having the Rhino license, I would like to do everything in mecway.

Fatmac

within MW u can use customised comands for gmsh - paste the following into the "custom Gmesh commands" in meshing parameters and u will get a reasonable 2d mesh


Mesh.Algorithm = 11;
Mesh.ElementOrder = 2;
Mesh.RecombinationAlgorithm = 3;
Mesh.RecombineAll = 1;
Mesh.SubdivisionAlgorithm = 1;
Mesh.SurfaceFaces = 1;



it may be possible to tweak the comands to get a better mesh but this is what I get with the above Gmesh comands

Fatmac

I 4got to add that sometimes u get better structured meshes (certianly in gmesh) if u partition the piece into 3 and 4 sided sections - slice them in ur CAD program and re-join them b4 exporting.


then try these gmesh comands

then i get something like this

cwharpe

@ing515:

• Your original "automatic & point refined" mesh actually looked pretty nice, for my purposes.
  
• I think your merging issues occurred because the element count along the edges of the Hole Plate mesh & block-out did not match.
  
• The manual meshing in MW takes a few minutes to set up. A better result is found if the perimeter element counts are compatible. "Refine/Custom" and Purse.py tools are useful. (Easier for me to work in linear elements then convert to quadratics at the last, improve by Project to Cylinder.) See attached images.
  
• Maybe give the Hole Tool a shot?
  

@Fatmac: Very nice Gmesh & Rhino mesh examples!

ing515

Thank you very much for your precious help