# [ICEM] Rotating of a 2D Blocking

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 November 30, 2012, 18:51 #21 Member   Join Date: Oct 2012 Posts: 46 Rep Power: 7 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

 November 30, 2012, 23:13 #22 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 Hi Ali Did you make this blocking using command 2d-3d with rotation option? As I am not succesful getting this command work.

 December 1, 2012, 03:24 #23 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 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.

December 1, 2012, 12:47
#24
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Ghazlani M. Ali
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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...
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Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali

 December 3, 2012, 10:56 #25 Member   Join Date: Oct 2012 Posts: 46 Rep Power: 7 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.

December 3, 2012, 13:52
#26
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Ghazlani M. Ali
Join Date: May 2011
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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...
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Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali

 December 4, 2012, 03:45 #27 Member   Join Date: Oct 2012 Posts: 46 Rep Power: 7 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.

 December 4, 2012, 07:51 #28 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 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.

 December 4, 2012, 12:49 #29 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 CFD_SIM, the bad quality is due to the your initial 2d blocking. Try to improve it

 December 4, 2012, 16:40 #30 Member   Join Date: Oct 2012 Posts: 46 Rep Power: 7 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 :-).

 December 4, 2012, 23:03 #31 Super Moderator   Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,358 Blog Entries: 6 Rep Power: 45 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.

December 4, 2012, 23:31
#32
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Sijal
Join Date: Mar 2009
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Quote:
 Originally Posted by CFD_SIM 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

Last edited by Far; December 5, 2012 at 00:36.

 December 5, 2012, 03:02 #33 Member   Join Date: Oct 2012 Posts: 46 Rep Power: 7 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 :-).

 November 18, 2015, 12:08 #34 New Member   Filippo Join Date: Nov 2015 Posts: 1 Rep Power: 0 Hello everybody, i'm new to ICEM. I watched the videos about "2d to 3d blocking by rotation" and i have a simple question: which kind of part is the one called "FLUID"? I mean, does it includes curves, surfaces etc ?

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