# periodic boundary conditions in CFX

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 June 4, 2014, 05:24 periodic boundary conditions in CFX #1 New Member   learner Join Date: May 2014 Posts: 4 Rep Power: 4 hello everyone i m new to cfx. i have a geometry where in i m taking only 90 degree sector as my computational domain and applyng periodic boundary conditions on the sector edges. i tried using interfaces in cfx but the solution runs only for few iterations and then diverges. i want to know the proper way of implementing periodic BC in CFX it ll be great if u could help me ' thanx in advance

 June 4, 2014, 06:25 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,717 Rep Power: 99 Please post an image of what you are modelling.

 June 6, 2014, 00:31 #3 New Member   learner Join Date: May 2014 Posts: 4 Rep Power: 4 hello glen thank you for your reply. here is the model(attached below) this is a 90deg sector. 1 and 2 are to be periodic inlet is shown (nozzle) and outlet is also shown .. i define the periodicity in ICEM (global mesh setup) definition. and then in CFX i make a interface specifyng the axis But my solution diverges after few iteration Thanx http://imageshack.com/a/img853/7610/0jkx.png

 June 6, 2014, 06:16 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,717 Rep Power: 99 It looks OK so far. Can you post the output file? Have you tried the normal things to improve convergence? That is smaller time steps, better mesh quality, double precision numerics and a better initial condition?

 June 6, 2014, 07:06 #5 New Member   learner Join Date: May 2014 Posts: 4 Rep Power: 4 i have tried double precision but same error. mesh quality as per ICEM is around 0.2.. ill try for smaller time steps. can u throw some light on specifying rotational periodicity in cfx? it ll be great if u could help Thanx

 June 6, 2014, 07:19 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,717 Rep Power: 99 Have a look at the tutorials. Any of the rotating machinery tutorials will use rotational periodicity.

June 6, 2014, 14:02
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learner
Join Date: May 2014
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Quote:
 Originally Posted by ghorrocks Have a look at the tutorials. Any of the rotating machinery tutorials will use rotational periodicity.
it would be great if u could post a link to be followed.

Thnx

 June 6, 2014, 22:16 #8 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 568 Rep Power: 11

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