CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ICEM] ICEM MRF Interface - Penetrating Elements

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree5Likes
  • 1 Post By Far
  • 4 Post By survADe

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 6, 2012, 04:48
Default ICEM MRF Interface - Penetrating Elements
  #1
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
Hello ICEM users,


I need to generate a Mesh with two domains for a MRF simulation. Overall it is one cylinder filled with one fluid, whilst the outer wall is ROTATING. I cannot tell you all the details so you have to believe that an interface is necessary even though this simple case can be solved without. As there is a stationary and rotating domain it is splitted in two cylinders. The outer one is the domain with the rotating wall and it is linked via an interface to the stationary inner domain. This leads to three interface surfaces dividing the two domains. It is a very basic configuration so I don’t think I need to add geometry. However If interested I will post it.


I checked the Geometry with Blocking topology and everything is ok (all red lines). Material points are set for each domain.


After doing Tetra/Prism Meshing with ICEM 13 (Volume Meshing with Tetra Mixed and Octree Method) I get a beautiful mesh, with no mesh errors. So far I am very happy. In order to generate a MRF simulation in Fluent I need for each interface side a surface. I did this by using >Edit-Mesh/Split Mesh/Split Internal Wall (Create Volume Cells is unchecked!). Three additional parts are generated ending with “…Back”. Now If I do Mesh Check I get “Penetrating Elements” along the interface. So far all attempts to repair the surface mesh with ICEM result in merging the second interface surface (interface…_back) with the former interface, i.e I cannot perform MRF in Fluent.


I also used the un-splitted mesh in Fluent and did the job in Fluent by using >mesh/modify-zones/slit-face-zones but then I get degenerated contact points and also the mesh check in Fluent fails.


I guess there is a simple solution for this problem - how to do this in a top-down approach and not necessarily need to mesh the two parts separately. Hope there are some clever guys out there who might know the answer.
Attached Images
File Type: jpg Pic1.jpg (16.4 KB, 501 views)
File Type: jpg pic2.jpg (45.8 KB, 523 views)
File Type: png pic3.png (63.2 KB, 499 views)
File Type: png pic4.png (82.8 KB, 510 views)
survADe is offline   Reply With Quote

Old   September 10, 2012, 04:41
Default
  #2
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
Somebody who has idea??? Maybe it is quite simple I am stuck at this point
survADe is offline   Reply With Quote

Old   October 10, 2012, 10:11
Default
  #3
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
I uploaded the icem files for the problem

https://www.dropbox.com/sh/e7tp9j1t7inx71w/_DPUUkLTui

maybe this helps

Regards
survADe is offline   Reply With Quote

Old   October 10, 2012, 11:43
Default
  #4
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
create the two concentric regions and mesh them seperatly in ICEM and export mesh. Open these meshes in Fluent and create interface there.
dlmuyx likes this.
Far is offline   Reply With Quote

Old   October 13, 2012, 12:27
Default
  #5
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
Thanks Far for the reply. The separate meshing works fine! I get no errors from icem at the concentric region.

When I read it into Fluent13 the coupled walls are automatically slitted and shadow walls are generated. Normally you can than choose from the boco type 'interface' but here it is not possible (see Figure).

Is there something wrong with the way I tried?

Regards.
Attached Images
File Type: jpg IcemSepMeshingApp.jpg (35.2 KB, 524 views)
survADe is offline   Reply With Quote

Old   October 13, 2012, 13:21
Default
  #6
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
Quote:
Originally Posted by survADe View Post
Thanks Far for the reply. The separate meshing works fine! I get no errors from icem at the concentric region.

When I read it into Fluent13 the coupled walls are automatically slitted and shadow walls are generated. Normally you can than choose from the boco type 'interface' but here it is not possible (see Figure).

Is there something wrong with the way I tried?

Regards.

So two separate meshes works fine? Right?

The method you are working doesn't seem right to me. Someone else may share their experience as well.
Far is offline   Reply With Quote

Old   October 13, 2012, 13:52
Default
  #7
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
Dear Far,

yes the meshing in icem works.
1.) I meshed the inner concentric volume
2.) I meshed the outer one with "Use exisiting mesh parts" checked and also once with not checked (then ICEM asks me to merge the two meshes)

I fixed the problem now!

Take the mesh from ICEM into Fluent and the walls will be automatically splitted (->shadow walls). By this you will see the same reduced BOCO options as I sketched in the previous post. Go to /mesh/modify-zones/slit-face-zone in Fluent and type in the ID of one of the interface walls. Now you are able to choose Interface.

Thanks for the help Far!
Attached Images
File Type: jpg SepMeshing.jpg (44.1 KB, 72 views)
syavash, m5edr, metmet and 1 others like this.
survADe is offline   Reply With Quote

Old   October 13, 2012, 14:57
Default
  #8
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
good info and post. Can you make it blog on cfd-online? to help the future queries?
Far is offline   Reply With Quote

Old   October 14, 2012, 04:50
Default
  #9
New Member
 
Join Date: Aug 2012
Posts: 10
Blog Entries: 1
Rep Power: 13
survADe is on a distinguished road
sure no problem. Done

Regards
survADe is offline   Reply With Quote

Old   February 4, 2015, 03:26
Default Problem with interfaces
  #10
New Member
 
SUBODH KHULLAR
Join Date: Jan 2015
Posts: 6
Rep Power: 11
sk692 is on a distinguished road
Hi survAde

I am facing the same problem with interfaces. I am working on a centrifugal pump.
I meshed it in ICEM and exported the mesh to fluent.
I did the interfacing in fluent as you indicated in your post and also tried another 2-3 ways but the results are all wrong.

Can you help me out with the problem. See if I am missing something.

You can find my problem here.

thank you
sk692 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Confused about periodic interface Jeff STAR-CCM+ 3 August 15, 2012 23:30
ICEM and CFX report different number of elements Chris Basciano CFX 0 July 20, 2007 18:24
Interface from ICEM to AVBP?? Lee Main CFD Forum 0 October 2, 2005 10:25
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55
Replace periodic by inlet-outlet pair lego CFX 3 November 5, 2002 21:09


All times are GMT -4. The time now is 22:45.