GAMBIT Meshing

vit.ankit · September 27, 2011, 03:34

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

.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

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

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

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

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
Sans titre.jpg

-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.

September 27, 2011, 03:34	GAMBIT Meshing	#1
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	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

September 28, 2011, 01:22		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	which format did you import in Gambit? __________________ In memory of my friend Hervé: CFD engineer & freerider

September 28, 2011, 01:27	@max	#3
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	.sat format (ACIS)..

September 28, 2011, 01:45		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	do you have the possibility to get step file? or parasolid? __________________ In memory of my friend Hervé: CFD engineer & freerider

September 28, 2011, 02:14	max	#5
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	no...im using autoCAD 2007....

September 28, 2011, 07:05		#6
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	ok I have your geometry in front of me. What do you want to compute? I have some thin wall structure inside a cylinder __________________ In memory of my friend Hervé: CFD engineer & freerider

September 28, 2011, 07:11	reply	#7
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	i want that 3D sat file to be imported to Gambit envirnment in 2D...FORMAT CAN BE ANY...

September 28, 2011, 07:20		#8
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	you mean without z-extrusion? __________________ In memory of my friend Hervé: CFD engineer & freerider

September 29, 2011, 01:33	@max	#9
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	yes..........

September 29, 2011, 02:00		#10
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	If I delete the z-extrusion, it only remains the source edges. What do you want to compute finally? __________________ In memory of my friend Hervé: CFD engineer & freerider

September 29, 2011, 02:12		#11
vit.ankit New Member ANKIT GUPTA Join Date: Sep 2011 Posts: 8 Rep Power: 14	i want the mesh to be a 2D model in GAMBIT so that i can sweep it along any vector....thats it...

September 29, 2011, 03:09		#12
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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 Sans titre.jpg __________________ In memory of my friend Hervé: CFD engineer & freerider

September 29, 2011, 03:49		#13
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	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. __________________ In memory of my friend Hervé: CFD engineer & freerider

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