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

[ICEM] Rotating of a 2D Blocking

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

Like Tree6Likes

Reply
 
LinkBack Thread Tools Display Modes
Old   November 30, 2012, 18:51
Default
  #21
Member
 
Join Date: Oct 2012
Posts: 46
Rep Power: 4
CFD_SIM is on a distinguished road
Thank you very much!

I will take a look at your changes on monday.
Was there a lot to change in my initial blocking? From the picture i see that you reduced the nods and i think you deleted the spacing. Was that the problem?

Greetings

John
CFD_SIM is offline   Reply With Quote

Old   November 30, 2012, 23:13
Default
  #22
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
Hi Ali

Did you make this blocking using command 2d-3d with rotation option? As I am not succesful getting this command work.
Far is offline   Reply With Quote

Old   December 1, 2012, 03:24
Default
  #23
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
Steps to make the 2d blocking for the symmetrical channel and then subsequent conversion to 3d mesh using the ICEM Command : Create block > 2d to 3d > method 2d to 3d

The general procedure is :

1. Make the appropriate points and curves at one location, let say at 0 deg. This is used to hold the initial blocking.
2. Points were made at the 4 corners. Two were already available, so extra two points were created at the two opposite corner.
3 2d blocking was initialized.
4. Association was made at the four corners points as discussed in step 2.
5. Appropriate splits were made and unwanted blocking was deleted.
6. Association of edges to curves and vertex to points were made.
7. Some extra points were also created to hold the blocking at the proper locations.
5. Edge mesh parameters were set and premesh was inspected.
6. Now go to create block panel again and choose option 2d to 3d.
7. Set method to rotate.
8. centre should be origin - default option
9. Axis of rotation Z axis
9. Angle = 90
10. Number of copies 4 so it will make the blocking in 4 step with each step of 90 deg, If you select the angle = 45 then you should increase the no of copies to 8
11. Points per copy =30 or whatever value you want. This will make the nodes per edge = 30 for each 90 deg. so total number of nodes on full circumference shall be 30*4 = 120.
12. Create part curves and put all curves in this part and similarly for the points. This is necessary for the boundary conditions as we are going to define the boundary conditions for the surface (3d case now) and surfaces must not contain the edge or points.
13. Select solver Ansys-Fluent
14. Give boundary conditions.
15. Convert premesh to unstructured mesh by right clicking on the premesh and choosing the option convert to unstructured mesh.
16. Output the mesh and read in the Fluent.
17. Check the mesh quality in Fluent.

Three set of files are attached.

1. Raw blocking (step1)
2. 2D blocking (step2)
3. 3d Blocking (Final)

https://dl.dropbox.com/u/68746918/2d-3drotation.rar

Note : Original idea is by diamondx
diamondx likes this.
Far is offline   Reply With Quote

Old   December 1, 2012, 12:47
Default
  #24
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
Quote:
Was there a lot to change in my initial blocking? From the picture i see that you reduced the nods and i think you deleted the spacing. Was that the problem?
Not at all, just run an update with fix blocks... this is why the number of node was initialized. Always try it when you feel lost in your blocking.

yes FAR i used that command... made 4 copies with 90 angle...
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   December 3, 2012, 10:56
Default
  #25
Member
 
Join Date: Oct 2012
Posts: 46
Rep Power: 4
CFD_SIM is on a distinguished road
Hi,

what exactly do you mean by "run an update with fix blocks". Do you mean, that i just should adjust the vertices or is it an actual button that i can't find.

I tried it today with my initial blocking and went on like far wrote here, but i still have the same problem with the mesh. Boundarys are showen, but there are still elements overlapping.

I hope that i will have more time tomorrow evening to look at the problem.
CFD_SIM is offline   Reply With Quote

Old   December 3, 2012, 13:52
Default
  #26
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,291
Blog Entries: 23
Rep Power: 20
diamondx will become famous soon enough
Quote:
"run an update with fix blocks"
Yes it is a button, in the pre-mesh tab... depending on which version of icem you have the version 14 include an update with a "fix" feature that you can check.
In version 13, there is only an update button while you can do a fix in another tab...
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   December 4, 2012, 03:45
Default
  #27
Member
 
Join Date: Oct 2012
Posts: 46
Rep Power: 4
CFD_SIM is on a distinguished road
I'am using the version 14.5.

Do you mean the button "Edit Mesh" --> "Check Mesh"?
This one i tried, but it only fixes some problems, but not all. Or is there another button, which i did not see.
CFD_SIM is offline   Reply With Quote

Old   December 4, 2012, 07:51
Default
  #28
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
see this

https://dl.dropbox.com/u/68746918/2dto3d.mp4


I tried on youtube but no success.


PS. Please wait few hours, before that you may get the error 404
CFD_SIM likes this.
Far is offline   Reply With Quote

Old   December 4, 2012, 12:49
Default
  #29
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
CFD_SIM, the bad quality is due to the your initial 2d blocking. Try to improve it
Far is offline   Reply With Quote

Old   December 4, 2012, 16:40
Default
  #30
Member
 
Join Date: Oct 2012
Posts: 46
Rep Power: 4
CFD_SIM is on a distinguished road
Thanks a lot!

The video is really helpful. I did not use the additional points, so that may be something that made some of the bad quality.

I will try a new initial blocking tomorrow and hope that it will look better.
It seems, as if there would not appear a good quality if i only associate the points to the vertex eg.

Would be nice of you, if you could let the video online for a while :-).
CFD_SIM is offline   Reply With Quote

Old   December 4, 2012, 23:03
Default
  #31
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
Yes, only association to points will give you many errors, like uncovered faces etc. It is must to associate the edge to curves for the proper definition of boundary conditions.
Far is offline   Reply With Quote

Old   December 4, 2012, 23:31
Default
  #32
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,914
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
Quote:
Originally Posted by CFD_SIM View Post


Would be nice of you, if you could let the video online for a while :-).


It is for ever. I believe in sharing the knowledge

Part I
http://www.youtube.com/watch?v=sIEEz...ature=youtu.be

Part II
http://www.youtube.com/watch?v=b-T0c...ature=youtu.be

Part III
http://www.youtube.com/watch?v=Ygcda...ature=youtu.be

All Parts in one clip:
http://www.youtube.com/watch?v=JxUnE...ature=youtu.be
diamondx, sharonyue and CFD_SIM like this.

Last edited by Far; December 5, 2012 at 00:36.
Far is offline   Reply With Quote

Old   December 5, 2012, 03:02
Default
  #33
Member
 
Join Date: Oct 2012
Posts: 46
Rep Power: 4
CFD_SIM is on a distinguished road
Thanks a lot!

Of course i meant that i've done the associations edge to curve, too.
I will look at my initial blocking and hope that i will find the problem soon :-).
CFD_SIM 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
Rotating Impeller Naith FloEFD, FloWorks & FloTHERM 22 November 5, 2012 09:53
[ICEM] Blocking and Symmetry BrolY ANSYS Meshing & Geometry 32 August 24, 2012 03:13
Vertical Axis Wind Turbine Rotating Domain Problems TWaung CFX 4 May 1, 2012 03:14
Problems with rotating machinery (Centrifugal Pump) in FLUENT RR2 FLUENT 0 April 2, 2012 06:28
question about governing equation in CFX using rotating/non rotating reference frame rystokes CFX 0 January 12, 2010 07:14


All times are GMT -4. The time now is 02:10.