# Grid Skewness

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 January 4, 2004, 16:09 Grid Skewness #1 Tamer Guest   Posts: n/a Sponsored Links 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? Thanks

 January 5, 2004, 04:07 Re: Grid Skewness #2 Rami Guest   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.

 January 9, 2004, 04:31 Re: Grid Skewness #3 Jonno Guest   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!

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