# CFD analysis on wind turbine rotor

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 March 31, 2011, 22:59 #41 Member   Naimish Harpal (MS Aerospace Engr) Join Date: Jul 2009 Location: Long Beach, CA Posts: 50 Rep Power: 16 Thanks for sharing the technical papers. mamyjooooon likes this.

 February 9, 2016, 13:16 when to stop iteration to get correct result. #44 New Member   pratik anand Join Date: Feb 2016 Posts: 6 Rep Power: 10 i am calculating drag force of moving vehicle for that i set BC and drag monitor for desired part then start iteration and i stop iteration in a regular time period and found different value of drag force at different iteration so,please give me idea when to stop iteration to got correct result.thanks for your suggestion.

 February 9, 2016, 13:48 #45 Senior Member   Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 377 Rep Power: 18 Apply the monitors for Drag, set your values and after (say 1000 iterations) plot the monitor file, if you see a cyclic variation over a period of certain iterations (lets say 500), take the mean of drag for this cyclic trend. If the values are constant then take them as it is. no need to take mean.

February 9, 2016, 14:07
#46
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pratik anand
Join Date: Feb 2016
Posts: 6
Rep Power: 10
Quote:
 Originally Posted by Shamoon Jamshed Apply the monitors for Drag, set your values and after (say 1000 iterations) plot the monitor file, if you see a cyclic variation over a period of certain iterations (lets say 500), take the mean of drag for this cyclic trend. If the values are constant then take them as it is. no need to take mean.
the fact is that ,the drag monitor (Cd) remain constant after 30 -35 iteration and continues as much as iteration taken and the value is
for iteration 80 , force approx 8000 and inlet -outlet mass =.3
for iteration 100, force approx 6000 and inlet -outlet mass =.002
for iteration 100, force approx 6000 and inlet -outlet mass =.002
for iteration 520, force approx 208 and inlet -outlet mass =.08
so i m confused