|March 11, 2016, 14:42||
Exponential en Bi-exponential grading
Join Date: Nov 2015
Posts: 15Rep Power: 3
I am experiencing some problems with grading in gambit.
I could not find a gambit manual since all the links to user manuals are offline.
I found another source that mentions the following (that obtained the formula from the gambit manual).
For exponential grading, gambit uses the following formula:
R = exp( (L/n) * (x-0.5))
x = ( ln(R) / (L/n)) + 0.5
R = the ratio's of the cells.
L = the length of the edge
n = the number of intervals
and x is the ratio to specify in gambit
For example when having a edge with a length (L) of 15 with a cell ratio (R) of 2 and 4 intervals (n), thus a line with intervals with a length of 1-2-4-8, this results in a ratio of 0.6868 in gambit.
However when specifying this ratio in gambit and when looking at the intervals, the stretching ratio's of the cells are not equal to 2 (closer to 1.5).
A ratio around 0.776 in gambit is required to obtain the stretching ratio (R) = 2.
Could someone tell me how the exponential and bi-exponential grading works? In grid I want to apply stretching ratio's of 1.1 over the entire domain.
Thank you in advance,
|March 14, 2016, 02:27||
Join Date: Mar 2009
Posts: 3,160Rep Power: 32
In memory of my friend Hervé: CFD engineer & freerider
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