
[Sponsors] 
April 2, 2014, 09:41 
symmetry vs periodicity

#1 
Senior Member
Join Date: Jul 2010
Posts: 152
Rep Power: 8 
Hello all.
I have a problem and I don't know how to model it correctly. On the picture you can see two domains. The one transparent is static domain and the yellow one is rotating. At the top of the static domains there is air inlet and on both sides there is air outlet. I think that I can't use both (symmetry on static domain and rotational periodicity on rotating domain) however static domain is symmetric. And I think that I can't use symmetry for rotating domain. Am I correct? Can someone help me please with this problem? Thanks in advance. Regards 

April 2, 2014, 10:50 

#2  
Senior Member
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 273
Rep Power: 13 
Quote:
The problem with your current geometry is that, because of the rotating domain, the flow isn't symmetric in the XY plane, making your geometry not representative of the flow you're trying to model. But if both outlets have the same operating condition what you can do, however, is use a symmetry for both domains in the XZ plane. The size of your problem should be roughly the same. Cheers 

April 3, 2014, 02:12 

#3 
Senior Member
Join Date: Jul 2010
Posts: 152
Rep Power: 8 
In fact this is very simple representation of my real model but idea is just like that. So you mean there is no chance to have only 180deg model? Do I really have to model full 360deg model?
Thank you. 

April 3, 2014, 04:10 

#4 
Senior Member
Join Date: Feb 2011
Posts: 288
Rep Power: 9 
As brunoc mentioned, you can slice your geometry by plane which is parallel to your inlet. This also will give you half of full geometry.


April 3, 2014, 04:15 

#5 
Senior Member
Join Date: Jul 2010
Posts: 152
Rep Power: 8 
As I said this is not real complex geometry that I actually have so I can't split it as mentioned above. Let's say that each inlet has different BCs.


April 3, 2014, 04:19 

#6 
Senior Member
Join Date: Feb 2011
Posts: 288
Rep Power: 9 

Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Possible Bug in pimpleFoam (or createPatch) (or fluent3DMeshToFoam)  cfdonline2mohsen  OpenFOAM  3  October 21, 2013 09:28 
Difference between periodicity and symmetry boundary conditions  lost.identity  Main CFD Forum  9  August 30, 2012 11:16 
[ICEM] Blocking and Symmetry  BrolY  ANSYS Meshing & Geometry  32  August 24, 2012 03:13 
[ICEM] Help for symmetry and periodicity conditions  OneDotThree  ANSYS Meshing & Geometry  10  March 7, 2012 05:28 
Rotational Periodicity or Symmetry?  gman89  CFX  3  May 18, 2011 18:45 