ICEM bunching law exponential 1
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 OGrid in the tube I want to keep the ratio constant and change the y+ value. The Bunching law of the OGrid 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*(i1)) with R= log((N1)*Sp1)/(N2) 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 abovenamed 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 
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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