# ICEM: O-Grid orthogonality

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 September 15, 2008, 10:40 ICEM: O-Grid orthogonality #1 jane Guest   Posts: n/a Dear all, I am trying to create an o-grid. No matter what I try, I end up with resulsts similar to the posted picture: The grid is not orthogonal to the wall at the inlet. Do you have any suggestion that could help me? Thanks alot! Rescaling the o-grid didn't help, but may be I am just selecting the wrong edge? Any help would be appreciated! Thank a lot! Best regards, jane [img=http://img171.imageshack.us/img171/1077/ogridnonorthogonalhv2.png]

 September 15, 2008, 10:41 Link inside #2 jane Guest   Posts: n/a

 September 15, 2008, 11:09 Re: Link inside #3 myron Guest   Posts: n/a You need to make the O-grid so it extends inside the inner-most circular piece. Then split the O-grid (along the 'radial' edge to capture the boundary of that inner protrusion. (This is instead of using the initial O-grid to capture that boundary.)

 September 16, 2008, 12:34 Thanks a lot! #4 jane Guest   Posts: n/a Dear myron, this was the way the go! After splitting the o-grid in the radial and horizontal direction I discarded the first four outer blocks, associated vertices, edges and faces - et voilá! Thank you very much for your input! All the best, jane

 January 29, 2011, 18:11 problem with mesh generation on O-grid #5 New Member   Join Date: Jan 2011 Posts: 2 Rep Power: 0 hi friends!! i am trying to mesh a cylinder with a hole in center.i generated o-grid well and associated vertices well.and after that set the pre-mesh parameters.but after that ICEM generated the mesh only for cylinder(around the circles ).and not for o-grid.sounds like that there is no O-grid generated in center of the cylinder !!help me please thanks!!excuse me for my bad English

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