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-   -   [ICEM] .stl file shell to solid part (http://www.cfd-online.com/Forums/ansys-meshing/115683-stl-file-shell-solid-part.html)

emily.imdieke April 4, 2013 14:09

.stl file shell to solid part
 
Hello,
I have an .stl file that contains a shell that I want to run using Ansys CFX. I don't know if it is possible to get ICEM to create a solid mesh through the empty core of the shell or if there is a way to make the .stl file solid in ICEM? I can get the shell mesh to import into Ansys but once this is done I can't set up up the boundary conditions due to it being a shell and what appears to be a lack of specified sections. Does anyone have any pointers for this?

asal April 4, 2013 14:49

Hi!

You can import the stl file as both mesh and geometry.
File => import Geometry => STL
File => import Mesh => STL

So if you import it as geometry, then you have a solid surface and you can generate mesh for it.

emily.imdieke April 4, 2013 15:40

I have done that, but that just imports the shell geometry and I need a solid geometry.

asal April 4, 2013 22:59

Hi!

Why you need a solid geometry. You need just shell geometry for meshing. ICEM will consider solid part (Body) out of the shells when you generate the mesh.

emily.imdieke April 5, 2013 12:39

Because I need that area inside the shell to be considered a solid body and meshed unless there is another way to do this to set up fluid flow running through in the shell.

Thanks,
Emily Imdieke

Far April 5, 2013 14:13

ICEM is surface modeller. To get the volume meshing you need material points.

siaarzh August 18, 2013 14:04

Fill it
 
If you're in the Design Modeller, do the following:

1) Make sure there are no gaps (use Surface Patch if you must)
2) Use Tools/Fill:
- Extraction Type: By Caps
- Target Bodies: Selected Bodies
- Bodies: 1 (select your patch)
- don't preserve capping bodies nor solids
3) Press "Generate"

a.sarami August 20, 2013 03:32

the same problem
 
I have also the same problem. I have STL surface mesh from MRI with one input and one output. The mesh is only on the surface. I read the Aorta example and tried to add two inlet and outlet parts, but to no avail. I cannot select inlet and outlet parts because there is actually no surface there, they are only two holes!
would you please help me how to get the volumetric mesh out of this surface and assign BCs on inlet and outlet?
Thanks
Ali

emily.imdieke August 20, 2013 11:46

For my geometry I ended up having to add points around the outlet and inlet, turn these into curves, and then create surfaces out of these curves in order to create the volumetric mesh.

I hope that helps.

a.sarami August 20, 2013 13:01

Dear Emily,
Thank you for your message. Actually my input and output are complex and I need too many points to get a good curve and so surface, and putting points on the edge manually is a very hard job. Do you know any other alternative way?
Cheers

siaarzh August 20, 2013 13:12

I'd love to help you, Ali. But it would be good to see the geometry itself. Can you post a picture? Are you using DesignModeler to work with the geometry?

One idea: maybe you could create surfaces that cover up the inlet and outlet. Then boolean it (cut the outsides) and fill the resulting geometry to create a fluid zone.

a.sarami August 20, 2013 13:27

2 Attachment(s)
Dear Serzh,
Thank you so much for your message and help. Please see the photos. Yes I need to fill the geometry to get the fluid zone and for it I need to first close the geometry.
Please take a look at the photos.
I am using ICEM CFD not the DesignModeler.

siaarzh August 20, 2013 15:11

Quote:

Originally Posted by a.sarami (Post 446950)
Dear Serzh,
Thank you so much for your message and help. Please see the photos. Yes I need to fill the geometry to get the fluid zone and for it I need to first close the geometry.
Please take a look at the photos.
I am using ICEM CFD not the DesignModeler.

I'm not very familiar with ICEM, since I never used scanned data for cfd. DM was enough for simple model generation.

But from what I tried out in the past hour in ICEM, I believe you could try to use "Geometry/Create faceted/Faceted cleanup/Close faceted holes". Select the inlet or outlet boundary by click-drag (box select). This should close it.

a.sarami August 20, 2013 17:09

Thank you very much Serzh. It just works and I closed the inlet and outlet. But how to fill the geometry for the fluid zone?
Thanks in advance
Ali

a.sarami August 20, 2013 17:14

I assumed that you, Serzh, previously post about how to fill the shell in DM. It would be great if I can export my closed surface in ICEM and then import it in DM, is it possible? if yes, how?
Thanks

a.sarami August 21, 2013 02:27

Quote:

Originally Posted by emily.imdieke (Post 418596)
Because I need that area inside the shell to be considered a solid body and meshed unless there is another way to do this to set up fluid flow running through in the shell.

Thanks,
Emily Imdieke

Emily,
Would you please let me know how to fill the shell after closing it?
Best


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