CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Zero area faces on the axis as symmetryPlane

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 16, 2007, 04:03
Default Dear All, I'm calculating a
  #1
Member
 
Matthias Kern
Join Date: Mar 2009
Location: Karlsruhe, Germany
Posts: 36
Rep Power: 8
make is on a distinguished road
Dear All,

I'm calculating a combustion chamber. The combustion chamber is a 1 cell thick rotational symmetric grid (cyclic not wedge type).
In CFX I use a symmetry bc for the axis. The axis consists of zero area faces only
I tried to use this grid also in OpenFOAM. I could transform it into an openFOAM grid by using the fluent3DToFoam tool after removing the periodic shadow faces. I've then taking into account the periodicity, applying couplePatches. So far everything went fine.
I defined the zero area elements on the axis as symmetryPlane as I did in CFX. Starting a calculation leads now to a floating point exception ( most likely division by zero).
Running checkMesh leads to some complains about 0 area faces (not surprisingly) and also some missoriented elements. The check for missoriented elements in ICEM doesn't show any.

My questions is now:
- Is it in general possible to use zero area
faces as symmetry in OF or do I have to retain
small area faces on the axis.
- Can I fix missoriented elements in OF.
make is offline   Reply With Quote

Old   October 16, 2007, 05:12
Default Yes, division by zero: either
  #2
Senior Member
 
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,758
Rep Power: 21
hjasak will become famous soon enough
Yes, division by zero: either collapse the faces or make them "small" + put a symmetry plane boundary condition on them.

Enjoy,

Hrv
__________________
Hrvoje Jasak
Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk
hjasak is offline   Reply With Quote

Old   October 16, 2007, 05:47
Default That did it! I made them real
  #3
Member
 
Matthias Kern
Join Date: Mar 2009
Location: Karlsruhe, Germany
Posts: 36
Rep Power: 8
make is on a distinguished road
That did it!
I made them really small and put a symmetry plane on them, works fine.

Thanks really a lot,
Matthias
make 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
How to specify the axis in 2D axis-symmetric case? B FLUENT 4 February 9, 2009 10:09
Question about symmetryPlane lin OpenFOAM Running, Solving & CFD 0 October 9, 2008 02:30
SnappyhexMesh and Symmetryplane bastil OpenFOAM Mesh Utilities 10 October 7, 2008 17:07
SymmetryPlane Boundary Condition raytracer OpenFOAM Running, Solving & CFD 0 July 11, 2008 17:04
Can Tecplot calculate isosurface area alon axis x? leaf Tecplot 0 May 21, 2007 12:20


All times are GMT -4. The time now is 06:29.