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Collision elements in HEXA mesh

Solution Partner Creator Solution Partner Creator
Solution Partner Creator

In meshing process with hexa elements fairly often leads to formation of deformed elements, which also have interpenetration. But no mesages about bad shape of elements. Usually it happens around the holes. Problem is in version 11.2.

 HEXA_mesh.JPG

Does anyone know how to solve this problem? How to prevent it?

 

If you open attached MODFEM, delete mesh, and mesh model again, result will be bad.

5 REPLIES

Re: Collision elements in HEXA mesh

Legend
Legend

Hi,

 

Post your model here we will investigate (if confidential, just a portion with your problematic mesh) . The problem is not clear enough.

 

Seifeddine Naffoussi

Re: Collision elements in HEXA mesh

Solution Partner Creator Solution Partner Creator
Solution Partner Creator
Hi, I posted model already.
Thanks

Re: Collision elements in HEXA mesh

Legend
Legend

Oh sorry I didn't read the last line.
Well your geometry is very basic.
Follow these steps:
1/ Create a Washer + Pad around the hole
2/ create a 2D mesh on one surface. 
3/ Mesh / Extrude / Elements , select 2D elements to create HEXA elements.
4/If you want to attach your mesh to the geometry then use Modify / Associativity command.

 

Surface.PNG

 

 

MEsh2.PNG

 

 

MEsh3.PNG

Seifeddine Naffoussi

Re: Collision elements in HEXA mesh

Siemens Phenom Siemens Phenom
Siemens Phenom

You can also surface mesh first, and tell the quad mesher to lay down some nice edge quads -

 

Mesh - Geometry - Surfaces 

Select All

Hit the "More Options" and set "Quad Edge Layers" to 2

Ok

Yes to "Ok to mesh with Plot-Only Elements"

You will now have a surface mesh with nice quads around the holes.

Now Mesh - Geomtry - Hex Mesh Solids

Since the surface are already quad meshed, they don't get meshed again, the hex mesher use the existing ones and creates a nice hex mesh -

 

hex1.bmp

Re: Collision elements in HEXA mesh

Solution Partner Creator Solution Partner Creator
Solution Partner Creator
Thank you. It works great.