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

[ICEM] surface/curve mesh setup

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

Like Tree1Likes
  • 1 Post By PSYMN

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 7, 2013, 04:35
Default surface/curve mesh setup
  #1
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Hello everybody,

I have a question regarding the surface an curve mesh setup. It's probably pretty simple, but since I'm new to ICEM, I don't get behind the sense of the setup.
I want to refine the surface mesh on the radial surface, as you can see it's pretty coarse and doesn't map the surface well.
As you can see in the pictures as well, I tried to refine the surface itself with the surface mesh setup and the edges with the surve mesh setup. Regardless whether I'm refining out of the setup menus (options: remesh attached surface/remesh selected surfaces) or the global surface mesh, the mesh stays the same. What am I doing wrong?
Any help is much appreciated!
Attached Images
File Type: jpg screen001.jpg (41.9 KB, 299 views)
File Type: jpg screen003.jpg (27.6 KB, 259 views)
File Type: jpg SurfaceMeshSetup.JPG (39.1 KB, 228 views)
File Type: jpg GlobalMeshSetup.JPG (40.0 KB, 175 views)
File Type: jpg CurveMeshSetup.JPG (45.9 KB, 133 views)
Studi is offline   Reply With Quote

Old   October 7, 2013, 05:56
Default
  #2
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
1. respect line elements

2. adapt mesh interior
Far is offline   Reply With Quote

Old   October 8, 2013, 07:08
Default
  #3
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Quote:
Originally Posted by Far View Post
1. respect line elements
2. adapt mesh interior
Thank you, Far, but it didn't change anything...
I should have mentioned, that this is only a surface mesh.
A confusing thing for me is the fact, that, if I'm generating a volume mesh, the settings are respected by the mesh (see pic 1). But if I go on and want to change local settings of the volume mesh, e.g. a curve, and ICEM fits the mesh again, the output is 'scrap' and doesn't respect the new curve settings(see pic 2).
Then again, I don't understand, why it's so hard to mesh the shell (surface mesh) first?!
Attached Images
File Type: jpg screen004.jpg (94.5 KB, 138 views)
File Type: jpg screen006.jpg (33.8 KB, 127 views)
Studi is offline   Reply With Quote

Old   October 8, 2013, 07:50
Default
  #4
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Maybe someone could take a look at the geometry. It was imported via STP. I ask, because during my 'research' I made i simple cuboid within ICEM to play with the curve and surface mesh setups. There it works without any problems.

Regards
Sebastian
Attached Files
File Type: zip geo.zip (15.6 KB, 12 views)
Studi is offline   Reply With Quote

Old   October 8, 2013, 11:29
Default
  #5
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
I usually set fillets as mapped quad surfaces so I get nice rows on anisotropic elements... If I really want triangles, I would convert quad to tri at the end.
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 8, 2013, 12:09
Default
  #6
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
Simon's suggestion is excellent. However the problem with your case is the sizing. Specially the global parameters.
Far is offline   Reply With Quote

Old   October 9, 2013, 04:52
Default
  #7
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Quote:
Originally Posted by PSYMN View Post
I usually set fillets as mapped quad surfaces so I get nice rows on anisotropic elements... If I really want triangles, I would convert quad to tri at the end.
Thanks for the suggestions. I'll try it, but not before next week with a feedback of the results.

Quote:
Originally Posted by Far View Post
Simon's suggestion is excellent. However the problem with your case is the sizing. Specially the global parameters.
Could you specify you're thoughts a little bit more, please? Did you load the model? I'm thankful for every hint...


Regards
Sebastian
Studi is offline   Reply With Quote

Old   October 9, 2013, 13:01
Default
  #8
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
I had not looked at your model...

I just downloaded it and tried it. Something strange (not normal behavior) on this simple model. When I get a chance, I will look into why it is not behaving as expected.
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 9, 2013, 13:23
Default
  #9
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
tried with patch independent and sizing function (min size, refinement etc) and here what i got. I will post link of tin file shortly.

Far is offline   Reply With Quote

Old   October 9, 2013, 13:32
Default
  #10
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Yea, but he should be doing it with Patch dependent quad with mapped surfaces... For some reason, it did not properly use his sizing. Usually, when I see that, the user has just set the ignore size too large, but in my few minutes to look at this, I didn't see that or any other reason for the strange behavior. I'll get back to it this evening if I can.
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 9, 2013, 16:05
Default Fixed...
  #11
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Found the problem...

In addition to the obvious issues like not setting sizes on your end curves, the real killer was that you had set "Curvature and Proximity Refinement" with a min size of 1, so it was ignoring any smaller sizes.

This got me this mesh with size 0.25.
Studi_01.jpg

If I increased the size to 0.5, I got this.
Studi_02.jpg

If I decided to increase the number of nodes around the fillet to 4, I got this.
Studi_03.jpg

If I increased the mesh size on the long curves to 1, I got this.
Studi_04.jpg

And finally, I converted quads to triangles... (assuming that is what you wanted?)

Studi_05.jpg
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 9, 2013, 16:07
Default File...
  #12
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Here is the tetin file... (rename the .txt to .tin)
Attached Files
File Type: txt project1.txt (39.5 KB, 26 views)
Studi likes this.
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 9, 2013, 16:12
Default
  #13
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Oh yea, I also did things like turned off the individual surface controls for mesh type, etc. You should start with global settings and only use individual entity controls when they need to deviate from the global...

So you could set quad as the global mesh type, but set all tri on specific surfaces where you didn't want mapped mesh (In this case, I set the size on the opposite side to 1 so the mesh wouldn't try to map triangles)...

Studi_06.jpg
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   October 9, 2013, 17:26
Default
  #14
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Wow, thank you so much for your help! Both of you!
This is a huge step forward for me in understanding what to do. If we should meet some time, beer is on me!
Thanks again for your time!
Studi is offline   Reply With Quote

Old   November 5, 2013, 04:01
Default
  #15
New Member
 
Join Date: Sep 2012
Location: Germany
Posts: 25
Rep Power: 14
Studi is on a distinguished road
Hi again!

There has come up a new question I'd like to ask regarding another region of the part I already introduced earlier.
I attached a picture. Concerning this, I've two questions:
1. Why does the mesh of the blue part reach out to a point of the green part? How to prevent it? As far as I've looked, there is no entity belonging to the blue part.
2. Why is there an offset from the border of the green part?

One general question I've left, too. Before you created a goof surface mesh. Is there a way to build a volume mesh based upon this surface?

Thanks to the specialists!
Sebastian
Attached Images
File Type: jpg screen003.jpg (80.5 KB, 113 views)
Studi is offline   Reply With Quote

Old   November 12, 2014, 00:32
Default
  #16
Senior Member
 
mohammad
Join Date: Dec 2010
Location: UK
Posts: 245
Rep Power: 16
mohammad is on a distinguished road
Hello everyone,

Can anyone please help me about my question.

http://www.cfd-online.com/Forums/ans...tml#post518634

Best Regards,
mohammad 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
[ICEM] Hexa mesh, curve mesh setup, bunching law Anorky ANSYS Meshing & Geometry 4 November 12, 2014 00:27
Mesh motion with Translation & Rotation Doginal CFX 2 January 12, 2014 06:21
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 11:55
Oscillatory mesh motion setup mesh flux ERROR jaswi OpenFOAM Running, Solving & CFD 5 August 23, 2007 04:41
basic of mesh refinement arya CFX 4 June 19, 2007 12:21


All times are GMT -4. The time now is 19:00.