# Cylindrical Symmetry

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

 September 21, 2012, 11:07 Cylindrical Symmetry #1 New Member   Vikram Reddy Join Date: Jun 2012 Posts: 13 Rep Power: 7 Hello CFX users, I have a reactor with cylindrical symmetry. How do I solve the problem on only one plane of theta?. I know this is to be done using slice material but when I slice an arc that does not form from the center of the cylinder. Please help.

 September 21, 2012, 11:30 #2 New Member   Dustin Join Date: Jan 2012 Posts: 18 Rep Power: 8 what program was used to make the geometry? Do you have the ability to modify that geometry, or was it given to you? For me, if it was given to me as a full cylinder (for example) in ProE, I'd much rather make the cyclic cut in ProE than in DesignModeler

 September 21, 2012, 11:52 #3 New Member   Vikram Reddy Join Date: Jun 2012 Posts: 13 Rep Power: 7 Thanks for the reply. I made the geometry myself in DesignModeler

 September 21, 2012, 13:48 #4 New Member   Dustin Join Date: Jan 2012 Posts: 18 Rep Power: 8 A picture would speak 1000 words. If I'm picturing your issue correctly, which it's possible I'm not, you're having trouble getting the slice to go through the centerline of the cylinder? Why don't you add a new coordinate system at the centerline on the face of your cylindrical geometry and sketch your slice so that you can constrain it to the geometry centerline?

 September 21, 2012, 13:52 #5 New Member   Vikram Reddy Join Date: Jun 2012 Posts: 13 Rep Power: 7 In the sliced material, when I give the inward thickness on extrude to be less than 2 cm( which is the radius of the cylinder), it accepts. But when I want it to be 2cm it wont accept the value. Does it make more sense now?

 September 21, 2012, 13:56 #6 New Member   Dustin Join Date: Jan 2012 Posts: 18 Rep Power: 8 sounds like you're trying to slice a wedge out of your cylinder, right? Your sketch needs to be opened. Don't draw the arc, just the two radials, like an open V. Is this what you're having trouble with?

 September 21, 2012, 14:00 #7 New Member   Vikram Reddy Join Date: Jun 2012 Posts: 13 Rep Power: 7 Yeah, you figured it out right but, I could draw the outer edge but not the one closer to the center i.e, i can not draw the sharp edge.

 September 21, 2012, 14:11 #8 New Member   Dustin Join Date: Jan 2012 Posts: 18 Rep Power: 8 The only other thing i can say is try with thin surface set as no. I'd have to see what you're talking about to help any further

 September 21, 2012, 19:44 #9 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 715 Rep Power: 13 Dont slice or cut your geometry. Just use TOOLS > SYMMETRY. Set to two planes, have one plane be whatever plane cuts through the center, and create another plane rotated 1 degrees or so off that one.

 September 24, 2012, 20:12 #10 New Member   Vikram Reddy Join Date: Jun 2012 Posts: 13 Rep Power: 7 Thank you very much, I used symmetry and it worked perfectly.

 September 25, 2012, 03:43 #11 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 715 Rep Power: 13 No problem. Yeah, the symmetry tool works very well for symmetry

 September 25, 2012, 06:50 #12 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 279 Rep Power: 14 Also, remember to set periodicity in ANSYS Meshing so that you get a 1:1 mesh connection when setting your periodic BCs in CFX. GGI interfaces do work pretty well, but by using a 1:1 interface you save memory and CPU time. Cheers

 September 25, 2012, 08:03 #13 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,219 Rep Power: 110 If the simulation has no swirl then use symmetry planes on the top and bottom faces. If the simulation has swirl then use periodic boundaries. BTW: This thread is an FAQ - http://www.cfd-online.com/Wiki/Ansys..._simulation.3F You might as well just point people to the FAQ. If you think the FAQ is wrong or could be improved then feel free to edit it.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Dimoon OpenFOAM Running, Solving & CFD 9 April 29, 2014 02:12 [ICEM] Blocking and Symmetry BrolY ANSYS Meshing & Geometry 32 August 24, 2012 03:13 gtg258f OpenFOAM 1 June 6, 2012 12:28 Cirion0000 CFX 0 July 6, 2009 14:26 Matt CFX 2 February 25, 2009 06:41

All times are GMT -4. The time now is 22:18.