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June 13, 2013, 11:38	grid normal to wall	#1
lavdwall New Member Laurien Vandewalle Join Date: Jun 2013 Location: Ghent, Belgium Posts: 29 Rep Power: 12	Hi all! Maybe a very stupid question to you but I only just started studying CFD and I was wondering... Why exactly is it necessary to make the angle between the wall and the grid as close to 90° as possible? It is always done like that but what is the mathematical/physical reason behind it?

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