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yuhehuan October 18, 2012 09:41

[ICEM] how to create internal wall?
Does sb know houw to creat a internal wall in ICEM CFD? Do i need to creat different blocks to creat internal walls?

energy382 October 19, 2012 06:35


Originally Posted by yuhehuan (Post 387340)
Does sb know houw to creat a internal wall in ICEM CFD? Do i need to creat different blocks to creat internal walls?

if you were using a blocking approach, you've to split blocking and associate block face to that part. cfx pre then creates a shadow wall.

if you were using tets, you've to use the edit mesh/split mesh/split internal wall method.

BrolY October 19, 2012 10:13

Mesh -> Part Mesh Setup -> select "int wall"

yuhehuan October 19, 2012 11:16

Thank you for all your reply! I WANT to extend my outlet. So the old outlet is considerd as the internal wall and the extended outlet is as the new outlet. But I am not sure how can I use the split mesh?

diamondx October 19, 2012 11:48

why you wanna use split mesh ???

yuhehuan October 19, 2012 12:03

2 Attachment(s)
Because I am thinking to generate mesh for the outer layer from the inner geometry.I think I haven' t understaned the idea you told me. Because I tried to generate internal walls by defining four different bodies and the internal walls are created. Then I meshed for the whole geometry and imported the mesh into fluent. But it is said mesh check failed and the error is as follows:

diamondx October 19, 2012 14:20

ok it's good, forgot to add that you need to define new body because of those outlet blocking the way to the mesh. they can have the same new bty... your error is may be due to the boundary seeting while exporting, did you declare your outlets as interior ?

diamondx October 19, 2012 14:21

would you mind attaching your project, without the ".uns" because its size is big. or zip it and in your dropbox and pass me the link...

yuhehuan October 19, 2012 14:58

OK. I attached the file. Let me know if you can open it in ICEM? Thanks a lot.

diamondx October 19, 2012 15:02


OK. I attached the file
where , i can't see the link??

yuhehuan October 19, 2012 15:23

sorry, I don't have a dropbox. It's so big that I can't upload. Can I email it to you?

diamondx October 19, 2012 15:25

yeah sure.....

yuhehuan October 19, 2012 15:34

ok, I sent it to your hotmail box.

diamondx October 19, 2012 15:57

here is your project, some bad quality elements were there, because you forgot to apply "build topology" and enable "curvature refinement"
Also you were setting outlet as interior, but your outlet had surfaces that should be used as well. pay attention when you create your part. make sure you selected the right surfaces and only those ones.
here is the link, tested on fluent and working :

yuhehuan October 19, 2012 16:16

Thank you so much for your reply! I will check it again and modified it to see if there is some improvement. :)

Far October 20, 2012 03:42

I think you should extended your surface with some built-in command or manually (create 5 or more additional surfaces) and start the meshing process from Ab initio. No need to create the internal wall, this function is used when you have wall inside the domain and there is fluid on both sides of this wall. Which is not the case with you.

you are mixing up internal wall with interior.

yuhehuan October 20, 2012 12:14

Hi, Far. Thank you for your reply. I did it according to what you said. Firstly, I offseted the original outlet and then extended them to generate the new outlets. The interfaces (original outlets) have been generated automatically. I tried to mesh for the whole geometry but it just can mesh the inner of thegeometry (the air_fluid body arounded by the original inlet and outlets). So I defined four bodies(the inner body and the outer three body arounded by the original and extended outlets). The mesh is finished but when I imported the mesh into Fluent, the mesh quality failed. I am so confused.

Far October 20, 2012 14:07

delete the two extra material points and use on material point for the new domain.

diamondx October 21, 2012 08:52

you can give them the same name, it's not a big deal...

yuhehuan October 21, 2012 15:06

Thanks a lot for your replies. I have sovled the problem of unassigned interface by through defining the gird interface in Fluent. But when I ran the calculation, there was an error that divergence detected in AMG solver: pressure correction. I am working on this problem.

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