|
[Sponsors] |
August 4, 2009, 22:01 |
help with ICEM Meshing
|
#1 |
Member
Join Date: Mar 2009
Posts: 48
Rep Power: 17 |
Hi everybody,
I have a bifurcation model with aneurysm at the middle. I want to do mesh the aneurysm and the pipes separately in ICEM to increase the quality of the mesh. But I don't know how to hide one part in ICEM and mesh the other parts and then joint both mesh together at interface. Any suggestion will be appreciated. Thanks |
|
August 4, 2009, 23:10 |
|
#2 |
Senior Member
Bharath kumar
Join Date: Apr 2009
Posts: 169
Rep Power: 16 |
hi,
you should name the parts separately and you can hide it easily.you can make interface between them in PRE. |
|
August 5, 2009, 00:36 |
|
#3 |
Member
Join Date: Mar 2009
Posts: 48
Rep Power: 17 |
Thanks for your response. Could you tell me how I can hide the part in ICEM. Do you mean I need to use subset or there is another way. Because when I right click on each part there isn't any option for hiding the part.
Thanks |
|
August 5, 2009, 09:57 |
Hide...
|
#4 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
In the model tree (on the right) you can expand the parts branch. There are check boxes next to each part name... You can just turn parts on or off... There are also options to right click on surfaces and blank them...
But this may not help you to "mesh the pipes separately to increase the quality of the mesh". How do you think separating them will increase quality? Are you hexa meshing the various sections? Are you planning to hex mesh the aneurysm and tet mesh everything else? If you give me a better idea of what you are doing, I can suggest a detailed process. |
|
August 5, 2009, 18:23 |
|
#5 |
Member
Join Date: Mar 2009
Posts: 48
Rep Power: 17 |
Hi As you can see in the picture I have a sharp aneurysm in the middle of the tubes with one inlet(250 ml/min) and two outlets. It's a steady-state laminar blood flow. I don't know why the model can not converge. I was thinking if I can mesh the tubes without aneurysm, the program can make a smoother mesh in the tubes and then somehow(I don't know how ) I add the aneurysm with merging the mesh at interface. I used mixed tet/hex mesh with 4 layers prism mesh. The quality of thye mesh after smoothing is 0.35. I tried to run the model with less amount of inlet and used the results as an inithial value for the next run. but still after a few run the program diverge. If you have any suggestion, please help me. http://www.cfd-online.com/Wiki/Image:B1.jpg Thanks |
|
August 6, 2009, 11:56 |
Breaking up may not help...
|
#6 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
I don't think breaking this model up will help with convergence... It would simply add another level of complication for the solver.
If you wanted to post the geometry and mesh (or send to me privately) I could check the mesh and see if I see any issues. If the mesh is fine, it may be your boco's that are the problem... |
|
August 10, 2009, 15:29 |
Hexa Mesh was easy...
|
#8 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Here you go (files sent privately)… Since you didn’t give any parameter guidance, I just did a 5 minute quickie job and didn’t try to optimize the mesh or improve quality at all…
One key thing I did was create some ISO Parametric curves and points to help me hang the blocking on your geometry… The rest was very basic Hexa. I didn't get your actual mesh params, so it may need tweaking, but generally speaking, if ICEM CFD Hexa doesn't converge, you know it is not a mesh problem... |
|
December 1, 2010, 08:55 |
(Y) shape like tubes
|
#9 |
New Member
Join Date: Nov 2010
Posts: 22
Rep Power: 15 |
Dear all
I presume this an easy issue to you and I would really appreciate if you can help me to hexa meshing my project. I am trying to mesh a (Y) shape like tubes with some sort of asymmetric nature. I am struggling in having a blocking strategy at the bifurcating zone. Therefore It will be much appreciated if you can advice me meshing the bifurcating zone ( Many Thanks GI |
|
December 1, 2010, 11:13 |
Y Pipe Collapse Blocks.
|
#10 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
GI12,
There is a tutorial for this, the Pipe Blade tutorial. In the tutorial you have a blade in a pipe, but you can imagine that half of it is a Y Pipe... The trick is to collapse blocks... In reality I would probably just use collapse blocks, select the edge to collapse, select all the blocks to collapse and apply (much faster than pinching out all the separate vertex pairs.) If the model were really this simple, this is the method I would always use. YBlock_1.jpg But there are lots of ways to do it, and some are helpful in certain situations. Here is the "extrude" method. I only use this when I have no other choice because it tends to clutter the index control (and I use the index control allot). YBlock_2.jpg Here are a variety of other methods. YBlock_3.jpg Have fun. |
|
December 1, 2010, 13:54 |
Survey
|
#11 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
One more thing...
----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey CFD Online Users Survey |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
ICEM Meshing | Jaloha | CFX | 0 | April 1, 2008 07:24 |
Missing tets along line when meshing with ICEM CFD | Georges P. Côté | CFX | 6 | March 23, 2006 01:34 |
How to exclude volumes from meshing in ICEM | Evgeniy | CFX | 2 | November 4, 2005 13:09 |
ICEM meshing problem | Forrest | CFX | 4 | May 25, 2005 19:37 |
ICEM 5.0 - double meshing | Joan | CFX | 0 | November 7, 2004 07:09 |