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[ICEM] How to subtract solid from fluid region ICEMCFD

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Old   August 20, 2011, 22:47
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Simon Pereira
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NormalVector... If you are working in 2D, then you are just working with shells and I don't think you end up with shadows, but I guess there is the side1 and side2 equivalent...

If you mesh them now, I guess it is meshing each "part" separately and then giving you "walls" around the perimeter of each part.

What you want is for it to mesh conformally between parts so that Fluent knows that the lines between the parts are interfaces?

You just need to create a multi-body part. Here are the steps

In DM, Create your named selections for each zone... Click on edges to create named selections for things like the interface, inlet and outlet. CLick on surfaces to create the 2D fluid or solid zones. Then left click (with the ctrl held down) to select all the parts you want in the multi-body part. Then right click and you will see an option that is something like "Form New Part" (sorry, the wording may be a bit different, I am writing this from memory). This will create a new multi-body part. Then save and proceed to ANSYS meshing.

In ANSYS meshing just mesh and it will automatically create a conformal mesh. Make sure you see your named selections... If you don't then maybe you need to check an option so they are passed from DM... Or you could just create them in ANSYS Meshing if you want (actually, I think ANSYS Meshing has easier tools for creating Named Selections).

Then send the mesh Fluent and your "INTERFACE" named selection will turn into "INTERFACE-side1" and "INTERFACE-side2". (They don't really call it a shadow wall for 2D).

Have fun.

Have
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Old   August 21, 2011, 06:42
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Thank you ,Simon.
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Old   January 11, 2012, 06:29
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Hi all,

Can Someone help me?

I am new user for ICEM CFD.
I have a real image from CT scan data in STL file format.
I have imported it into ICEM.
Can smoothing the image be done in ICEM?
When I checked the image in ICEM is in a surface body. Can ICEM create a solid body from this surface body?

Thank you so much is someone can provide me with information.

Regards,
Naima
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Old   January 11, 2012, 12:32
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There is a tutorial for bio-medical scan data... Check the customer portal and find the Aorta tutorial.

ICEM CFD is a surface based modeler. You don't need a solid. Just make sure the surface is "closed"; there are lots of STL repair tools to help you do this. Then put a material point inside and mesh...

ICEM CFD is not intended to smooth the image... It is design to mesh the model, not make it look "artificially" good. Programs like 3DExploration from XDimension Software do a good job of smoothing STL images...

Best regards,

Simon
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Old   January 11, 2012, 12:59
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If you're looking for a program to smooth and manipulate STLs, my research lab uses a program called 3-matic to do all of the prep work on geometry originating from CT scans. I don't have much experience with it but I think it works pretty well.
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Old   January 12, 2012, 02:03
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Hi Simon,

"There is a tutorial for bio-medical scan data... Check the customer portal and find the Aorta tutorial"

I have try this tutorial but always stuck with the function to create a part.
Why when I select the part, it will select the whole geometry?

" there are lots of STL repair tools to help you do this. Then put a material point inside and mesh"

May I know, what is STL repair tools?


Thank you.

Regards,
Naimah
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Old   April 10, 2012, 19:34
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Quote:
Originally Posted by wanna88 View Post
Hi all,

Can Someone help me?

I am new user for ICEM CFD.
I have a real image from CT scan data in STL file format.
I have imported it into ICEM.
Can smoothing the image be done in ICEM?
When I checked the image in ICEM is in a surface body. Can ICEM create a solid body from this surface body?

Thank you so much is someone can provide me with information.

Regards,
Naima
As for the tools, instead of Mimics, how about Slicer3D?

Could you let us know how you got on, this would be interesting-
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Old   April 10, 2012, 19:44
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@wanna88, you should probably run Geometry => Repair => Build Diagnostic topology to segment your model by angle before selecting surfaces to add to a part...

Under the geometry tab, there is an icon for repairing faceted geometry. Once you see the names of the commands, you can check the help for more info...
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Old   July 18, 2013, 15:08
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Hi guys,

Thansk for your helpful information in this regard.

I just have a question. I have a box includes a fluid and couple of solid objects. I have already drawn the geometry in ICEM and created the "Body" as fluid. But after meshing, I dont know why the mesh consists of the solid parts!

Any idea is apprecaited!
Thanks
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Old   July 18, 2013, 19:48
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Old   July 18, 2013, 20:45
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may be there are holes in your geometry... show us some pictures !
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New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
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Old   July 19, 2013, 13:28
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Thank you guys for your prompt responses.
I have read the book Ali posted online. It was very helpful. I m trying to correct the geometry a little bit since there are some unattached cells and will be sharing the final result with you.
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Old   August 20, 2013, 17:46
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I have somehow the same problem. I have a closed surface in ICEM (empty inner part) and would like to fill it to have an full solid body, How can I do that?
I appreciate any help.
Thanks.
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Old   August 22, 2013, 16:17
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Hi Ali Sarami,

Make sure you have done the following steps :

1. Your surfaces cretaed properly and named in the part section
2. The "internal wall" section has been turned on in the part mesh set-up for all the internal solid parts

Good Luck,
Amir
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