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Active Contributor
rmathan
Posts: 38
Registered: ‎02-17-2011

3d mesh problem

501 Views, 2 Replies
09-17-2012 04:19 AM

Dear Moldflow users,

 

I have a speaker grill part  with the part dimension 155x115mm. Thickness in the through hole area is 1.5mm and blind holes area is 2 mm with the blind hole depth of 1 mm.

 

I have meshed it with dual domain and corrected the aspect ratio till 10. I converted this mesh to 3D with the following settings.

I. General Tab:

1. Global edge length: same as Dual domain size of 3 mm

2. Merge tolerance: 0.01mm

3. Match mesh: unchecked

 

II. Tetra Tab

1. 3D mesher: Advancing Front

2. Minimum element number through thickness: 6

3. Maximum allowed edge length through thickness: 3.6

 

After generation of 3D mesh, checked mesh diagonistic,

I got very high max aspect ratio value: 1755.9

 

and in the fill analyis log lot of warnings, I have attached a log file for your reference in the post

 

I have tried many option. but nothing works:smileysad:

Why is this happening? Does anyone experience like this? I think it will going to be big impact on the analysis results.

 

Please help me to solve this.

 

Thanks,

Mathankumar. R

 

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Product Support
nordhb
Posts: 472
Registered: ‎03-23-2009

Re: 3d mesh problem

09-20-2012 01:51 AM in reply to: rmathan

Hi,
as not having access to the study for troubleshooting it is diffcult to say why this happens.
Just some comments.

The Help Explanation of this warning:
The input study file for this analysis contains two nodes which have identical coordinates.
A coincident node may indicate a problem in the mesh (for example two mesh regions which are not actually connected)
which will affect the solution.

The Help Resolution
Examine the two nodes in the GUI.
Use Modeling > Query Entities to locate the nodes.
Use Mesh > Mesh Tools > Nodal Tools > Merge Nodes to merge any unwanted nodes.
Now, this can be quite difficult with a tetra mesh.
But if nodes is same area it might give an understanding of why they are created.

You can also try Global Merge, with a small tolerance:
tab Mesh > Global Merge
Default tolerance: 0.1mm, change to something like 0.00001mm
After the merge, You can use the Mesh Wizard to check the 3D mesh quality
tab Mesh > Mesh Wizard
You can find and isolate the high aspect ratio elements, and maybe get an understanding why the are created.

Hope this helps.
Regards,
Berndt



Berndt Nordh
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Active Contributor
rmathan
Posts: 38
Registered: ‎02-17-2011

Re: 3d mesh problem

09-24-2012 09:49 PM in reply to: nordhb

Dear Berndt,

 

Thank you very much for information

 

I maynot able to send you the study file due to confidential. I will try my side to send you the sdy file.

 

 

 

Regards,

Mathankumar. R

 

 

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