|March 12, 2012, 07:04||
ICEM bunching law exponential 1
Join Date: Jan 2012
Posts: 1Rep Power: 0
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))
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
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