Question about meshing

Builder
Builder

Hi,

 

I have a model as shown in image below. The both side parts are half of the middle ones.

1.png

 

Selecting all of them, i set the same mesh setttings and got the mesh as shown below. I noticed that the mesh of the two half parts are obvious different. The upper one has more refinement in the curved face but the lower one does not. Since they are geometrical same and have the same mesh settins, i am wondering what might be the cause for this difference.

 

Thanks,

Kan

2.png3.png

3 REPLIES 3
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Re: Question about meshing

Phenom
Phenom

Kan,

 

the correct answer I can't give to you, but, to get identical meshes for your two splitted loops I would advise to use HEXAEDRON-meshes. The structure of your bodies "asks" for it and hex-meshes are more suitable for many things. And to get identical meshes overall I would split the complete loops in the same way. If you want to use symmetry for smaller mesh size don't hesitate to have only two splitted half-loops with a section angle of 30 degrees instead of 90 degrees. Of course I don't know your complete assembly, so it's only an idea while watching the pictures.

Best wishes, Michael

| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX12 | engelke engineering art GmbH, Germany | 2019-07-08
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Re: Question about meshing

Builder
Builder

HI Michael,

 

Thanks for your comments.

 

However, for my case, i can only use Tetrahedral mesh. I don't expect the mesh are exactly identical. By intuition, the two half loop parts should have similar mesh but not obviouly different. In any case, i will try your suggestion about splitting the half-loops with a section angle of 30degs instead of 90 degs.

 

Best Regards,

 

Kan

Re: Question about meshing

Phenom
Phenom

Kan,

do you know that you can force the number of elements at specific edges?

If you don't use such a functionality the mathematical effects during deviation of polygon body in FEM can induce such differences. Try to set identical "Mesh control" definitions for the specific edges by means of "Number on edge".

Best wishes, Michael

| Production: NX10; Development: VB, TCL/TK, FORTRAN; Testing: NX12 | engelke engineering art GmbH, Germany | 2019-07-08
| Kudos for good posts! And if my post answers your question, please mark it as an "Accepted Solution". Kick Off (2015-09-14)On the Map (2016-10-21)1st Gear 2018 (2018-02-19)5th Birthday! (2018-02-25)Popular (100, ‎2018-10-30)Prolific (100, 2019-02-27)Philosopher (500, ‎2019-02-28)Problem Solver (50, 2019-06-25)