# what is the computational formula of the grid spacings Δx+,Δy+,Δz+?

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 March 24, 2013, 04:24 what is the computational formula of the grid spacings Δx+,Δy+,Δz+? #1 New Member   Detian Liu Join Date: Mar 2013 Location: Beijing, P.R.China Posts: 20 Rep Power: 6 Hi all, I am a beginner of CFD, recently I have read a paper said that"The maximum grid spacing in terms of wall units is Δx+=20 in streamwise direction, Δy+=19 in spanwise direction, and Δz+=1 near the dune surface." But I do not know the computational formula of the grid spacings Δx+,Δy+,Δz+, could you tell me the definition about it, or give me some papers to read?

 March 24, 2013, 05:02 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,615 Rep Power: 26

April 26, 2013, 11:48
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 Originally Posted by Detian Liu Hi all, I am a beginner of CFD, recently I have read a paper said that"The maximum grid spacing in terms of wall units is Δx+=20 in streamwise direction, Δy+=19 in spanwise direction, and Δz+=1 near the dune surface." But I do not know the computational formula of the grid spacings Δx+,Δy+,Δz+, could you tell me the definition about it, or give me some papers to read?