# ICEM bunching law exponential 1

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 March 12, 2012, 07:04 ICEM bunching law exponential 1 #1 New Member   Sascha Join Date: Jan 2012 Posts: 1 Rep Power: 0 Sponsored Links Hello everyone, i want to analyse the influence of the mesh on the result. Therefor I created some meshes with different numbers of nodes. For the O-Grid in the tube I want to keep the ratio constant and change the y+ value. The Bunching law of the O-Grid is the Exponential 1 law. In the ICEM Help Engine I found the following equation to calculae the distance from the starting end to node i: S_i = Sp1*i*exp(R*(i-1)) with R= -log((N-1)*Sp1)/(N-2) S_i is the distance from the starting end to node i, Sp1 is Spacing 1, N is the total number of nodes, and R is the ratio In my case N is 38 and SP_1 is 0.002mm. So in my opinion S_38 should have the same value as the length of the edge wich is 22.5mm. But when I calculate S_38 with the above-named equations the result is S_38 = 0.2429mm. So what I wanted to do, is to change the total number of Nodes N and let the Ratio R constant. With these equations I wanted to calculate the new value for Sp1. But there seems to be a mistake in these equation. Can someone help? Thanks in advance

 March 21, 2012, 11:59 #2 Senior Member   Rikio Join Date: Mar 2009 Location: SH, China Posts: 182 Blog Entries: 1 Rep Power: 10 S_i is the length of the ith segment, i.e., from the segment's begining to end, rather than edge's begining to ith node.

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