# non-planar faces due to the deformation of grid

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 November 11, 2007, 17:30 non-planar faces due to the deformation of grid #1 gonski Guest   Posts: n/a Hi,guys. I would appreciate your help.I found sometimes my CFD grid have a big deal of nonplanarity due to the deformation/twist of the grid. I mean sometime rectangular cell faces are not not plane surfaces. So how this will affect the solution of fluid flow. Thanks in advance Regards, gonski

 November 11, 2007, 22:43 Re: non-planar faces due to the deformation of gri #2 Ahmed Guest   Posts: n/a what is needed is the cell surface area, so how much is the difference between the real surface area and the calculated surface area ? (which depends on the coordinates of the vertices)

 November 11, 2007, 22:50 Re: non-planar faces due to the deformation of gri #3 gonski Guest   Posts: n/a What kind of trouble can be observed in the solution of fluid flow?

 November 12, 2007, 06:21 Re: non-planar faces due to the deformation of gri #4 gonski Guest   Posts: n/a Interesting, I try to search some proofs for this non-planar problem in this whole day, and get nothing. There are one or two papers in finite element method discussing the problem. However their explanations are not convincing. Now everything push me to believe that non-planar faces should be no problem in finite volume method as no one talk about this problem. I would appreciate your comments. Best regards, Gonki

 November 12, 2007, 10:46 Re: non-planar faces due to the deformation of gri #5 Tom Guest   Posts: n/a The usual trick is to split the face into two triangles and define the normal to the face to be the average of the normals to the two triangles. If these two normals are very different (so that it effects your answer) then your grid needs smoothing (to the point where the error induced is comparable to the discretization error).

 November 12, 2007, 16:25 Re: non-planar faces due to the deformation of gri #6 gonski Guest   Posts: n/a Thanks a lot! Tom and Ahmed

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