3D Meshing using third party software

[mppkumar]

Hi

any one tried 3D mesh in third party software and imported into moldflow? 

could not able to launch the analysis with the mesh from 3rd party software; after remeshing only i could able to launch the analysis.

do we require to remesh it in Moldflow again? refer the attached image

Thanks

M P Pradeep Kumar

[harald_goetz · Accepted solution]

Have a look at this presentation (video and / or PDF)

http://au.autodesk.com/au-online/classes-on-demand/class-catalog/2014/moldflow-insight/sm5706-p

You'll find out that every external 3D mesh is "flagged" and needs to be remeshed (as you did and foudn out already).

Except: Hypermesh!

But you need to export the mesh as *.udm file.

I've never meshed with HM so far (but have access to it, - maybe I should try?).

There are some reasons to use an external mesher, but I usually export only the skin mesh to MF and remesh it to 3D.

There is a "Built your simulation IQ" series ongoing, which will have meshing as the topic, I guess it was planned for January 2015.

Stay tuned.

Harald

[mppkumar]

Hi

I will try to export as *.udm from HM

Thanks 

M P Pradeep Kumar

[Halasur]

Hi Pradeep / Harald,

I too tried the same, importing 3D mesh from Ansa to Moldflow unable to launch analysis.

Instead of re-meshing I created a tetra element in moldflow and changed the property by moving all the elements to that collector. It  works.  

Thanks 

Aravind Halasur

[harald_goetz]

Halasur,

it's like hacking moldflow. Cool.

Thanks for that!

[xusho · Accepted solution]

Moldflow 3D solvers has 2 extra requirements:

1. No tetras have all nodes on surface.

2. No internal tetra edges with 2 nodes on surface.

In this image, we can see 2 tetras: ABCD and EFGH.

Tetra ABCD has 4 nodes on surface.

Tetra EFGH has edge GH, both node G and H are on surface.

With Moldflow 3D mesher, those tetras will not be created. But third party meshers may generate those types of tetras.

After import a 3D mesh from third party, we need to do a minor refinement to avoid those tetras.

When you see "Refine mesh" on stuty panel, just double click it, uncheck a checkbox: Use surface mesh matching.

Then Moldflow mesher will check the mesh for those 2 types of tetras.

If found, it will split tetras.

If not found, it will not change the mesh, but will add a flag to indicate this mesh is OK for analysis. Then "Refine mesh" will become "3D Mesh" and ticked. You will be able to run analysis.

[mppkumar]

Hello Shoudong Xu

we did tried with exporting the file as *.udm from third part software and imported as *.udm into Moldflow; Got thru "Refine mesh" flag... 

While doing 3D mesh checking it showed the areas at edges are not having enough elements thru thickness... though we have 6 layers of elements in that region.

Now, i got the reason for it thru your reply... Thank you for your post

Thanks

M P Pradeep Kumar