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vit.ankit September 27, 2011 03:34

GAMBIT Meshing
 
hi,

I have designed my 3D grid in AutoCAD (digitised the geometry) and when i imported it to Gambit environment,i have 1000s of edges and faces which i want to reduce and from the wireframe (which i digitized) i cannot define my extruded AutoCAD as a volume...

Kindly advice

Regards
Ankit Gupta
CSIR-NEERI

-mAx- September 28, 2011 01:22

which format did you import in Gambit?

vit.ankit September 28, 2011 01:27

@max
 
.sat format (ACIS)..

-mAx- September 28, 2011 01:45

do you have the possibility to get step file?
or parasolid?

vit.ankit September 28, 2011 02:14

max
 
no...im using autoCAD 2007....

-mAx- September 28, 2011 07:05

ok I have your geometry in front of me.
What do you want to compute?
I have some thin wall structure inside a cylinder

vit.ankit September 28, 2011 07:11

reply
 
i want that 3D sat file to be imported to Gambit envirnment in 2D...FORMAT CAN BE ANY...

-mAx- September 28, 2011 07:20

you mean without z-extrusion?

vit.ankit September 29, 2011 01:33

@max
 
yes..........

-mAx- September 29, 2011 02:00

If I delete the z-extrusion, it only remains the source edges.
What do you want to compute finally?

vit.ankit September 29, 2011 02:12

i want the mesh to be a 2D model in GAMBIT so that i can sweep it along any vector....thats it...

-mAx- September 29, 2011 03:09

1 Attachment(s)
ok
Import your .sat into gambit
Move all your surfaces with specific vector for having your cylinder centered with your axis.
Then delete all surfaces from cylinder.
It remains only surfaces from your internal structure
Now, in delete-surface panel disable lower geometry and delete all the surfaces.
Delete all edges except the source faces from one cap (see picture)
Create one disk with your dimensions.
And now you need to split your surface with your edges.
I don't know why but you cannot select all the edges to generate your split.
So take some coffee, and pick edges one by one (you can split x-times if you want)
Once it is done, you just have to sweep your surface with your vector.
And finally go and mesh
Attachment 9358

-mAx- September 29, 2011 03:49

Wait I tried to sweep surface with some zig-zag splits, but it merge the zig-zag.
So on ce you create your disk, save your dbs.
Then merge your edges. I tried and you cannot merge all the edges on the fly, so you need to merge some series.
Once it is done sweep edge with vector (you will have your zig-zag surfaces, like your import)
Then sweep your disk, and split this volume with your zig-zag surfaces.


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