CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Grid Skewness

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

LinkBack Thread Tools Display Modes
Old   January 4, 2004, 16:09
Default Grid Skewness
Posts: n/a
Hi all, I am writing my own code for using non-othogonal collocated grids for finite volume method. Grids are structured. I did not scale the equatyions or the domain. What I am trying to solve is very narrow long channel that has a moving wall. The code crash due to grids skewness. domain length over width ration is about 500 (width about 1 mm) My question is what is the definition of skewness? Could this problem be solved by scaling the domain before reading and the equations?

  Reply With Quote

Old   January 5, 2004, 04:07
Default Re: Grid Skewness
Posts: n/a
"Skewness" is about angle deviation from orthogonality. The length/width ratio (usually termed "aspect ratio") is another measure of grid quality. Scaling therefore changes the aspect ratio but not the skewness. Try to build a grid which is closer to orthogonal.
  Reply With Quote

Old   January 9, 2004, 04:31
Default Re: Grid Skewness
Posts: n/a
Actually "skewness" has nothing to do with orthogonality. Orthogonal meshes can also be "skew" Skewness is the deviation from the line connection the cell centres of the cells bracketing a face to the face centre. If this line cuts the face at its centre the mesh is not skew!
  Reply With Quote


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
MapFields to New Grid For Extreme Grid Deformations due to Body Motion albcem OpenFOAM 0 May 5, 2009 14:17
Severe nonorthogonality and severe skewness problem qtian OpenFOAM Running, Solving & CFD 2 January 22, 2008 19:47
GRID TO GRID INTERPOLATION in FLUENT calogero FLUENT 3 June 4, 2003 08:32
Combustion Convergence problems Art Stretton Phoenics 5 April 2, 2002 05:59
Troubles modelling flow through a grid Hans Klaufus CFX 1 June 28, 2000 16:43

All times are GMT -4. The time now is 18:23.