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

[ICEM] Bocking Strategy Suggestions for 2d Trefoil Shape Inside Rectangle

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 22, 2012, 14:50
Default Bocking Strategy Suggestions for 2d Trefoil Shape Inside Rectangle
  #1
New Member
 
Join Date: Jan 2012
Posts: 5
Rep Power: 5
mullzer is on a distinguished road
Hi,

I am trying to model heat transfer for three individual cylinder in trefoil formation to their surroundings (see jpeg image CFD2). The trouble is that these meshes are not opening in Fluent (critical failure, error object #F).

I think the reason for this is that the mesh I have drawn in ICEM is inadequate as their is a blank space in between the three cylinders. No matter what way I split the main block I cannot got it it associate the edges to the entire perimeter of each circle which causes a problem for the computer. I was wondering if anyone had any suggestions on how I could split the blocks so that a mesh would go around each of the cylinders?

Currently, I have tried to make a block around each circle and delete the block that goes over the circle. I introduced a small gap between them to allow the mesh to continue into the centre (see jpeg image CFD). However all of my edges are horizontal or vertical and the mesh cannot continue join in from the two sides.

Any suggestions/ further questions are welcome.

Thanks in advance
Attached Images
File Type: jpg CFD.jpg (42.7 KB, 15 views)
File Type: jpg CFD2.jpg (49.8 KB, 10 views)
mullzer is offline   Reply With Quote

Old   February 22, 2012, 19:09
Default
  #2
New Member
 
Join Date: Jan 2012
Posts: 5
Rep Power: 5
mullzer is on a distinguished road
Due to the difficulties above, I am now trying to mesh the model as two separate models. I have meshed the inner part, and from what I can see there should be no problems with it (see image).

However, Fluent shows the error:
WARNING: no face with given nodes. Thread 9, cell 64
Clearing partially read grid.
Error: Build Grid: Aborted due to critical error.
Error Object: #f

Any ideas what is going wrong here?
Attached Images
File Type: jpg InnerPart.jpg (33.4 KB, 14 views)
mullzer is offline   Reply With Quote

Old   March 2, 2012, 15:06
Default
  #3
New Member
 
Join Date: Jan 2012
Posts: 5
Rep Power: 5
mullzer is on a distinguished road
i am still working on this error. after reading a few other posts about similar problems, it seems that it is usually due to a the presence of a hole in the geometry. Mine is a straighforward flat model bounded by three walls so it certainly doesnt seem like it i put a hole in the geometry.

also when I run a gemetry check in ICEM it just says "done: 3 curves".

One interesting thing is that when I generate an automatic surface mesh it says there are hole in your geometry do you want to repair them.. and the it opens the geometry repair window but I am still unsure how to go about repairing it.

I managed to open the mesh in CFX without an error but the model is wrong (it is jagged all around the edges) so this must be where FLuent thinks there is a hole. I am wondering how best to fix this geometry in ICEM?
Attached Images
File Type: png centrepiecceerror.png (8.3 KB, 6 views)
mullzer is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
meshing F1 front wing Steve FLUENT 0 April 17, 2003 12:37


All times are GMT -4. The time now is 07:51.