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Optimizer Only Changes First Iteration
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All,
I am having what seems to be a problem with touching up a hand layout using the optimizer. Essentially, I do a layout by hand and then ask OpenWind to optimize with that as the starting point. The issue that I am getting is that Openwind seems to only make changes to the layout on the first iteration. It will typically jump up and then flat line without change at infinitum. If I stop, save and restart the optimizer, then I get the first iteration boost before flat lining again. I am wondering if anyone has experienced this and if it is something that might be fixed by the Large Array Optimizer in the pro version. Any help would be greatly appreciated.
Cheers,
Nathaniel
Hmmm, thats a nasty one and one I haven't seen yet. I do use openWind from time to time and I have done the same thing without seeing that. Can you send me your workbook please?
I hope to be putting out another release in the next few days so definitely try it with the new release too and let me know if you are not able to send your workbook.
Nick
We've seen this. It generally happens to us when there is just no more space to move the turbines around and the optimiser simply can't find any other options considering the parameters you've set. Our fix is to either change the spacing, reduce the number of turbines, or accept that layout as-is. Normally in this case, although the jump looks massive on the optimizer graph because of the scale, the jump is really like .1% or less.
Hey Alicia,
There is something in the commercial version of openWind that I think will help you. I'm hoping to have it fully validated and ready for release early in the new year. I saw exactly what you're describing and came up with a fix which appears to work well in most cases of large and/or very constrained layouts.
Nick
Nick and Alicia,
This sounds like the exact situation where I am seeing these problems. I'd be interested to see how this works in the commercial version. Let me know if you would still like a workspace which demonstrates these problems.
Cheers,
Nathaniel