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NREL / SOWFA

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An issue about average wind speed calculation #88

Open xxh0523 opened 2 years ago

xxh0523 commented 2 years ago

Merry Christmas and Have a Good Holiday!

First of all, thank you for sharing SOWFA. It helps us a lot and we really appreciate it.

Recently, we have been using SOWFA to calculate average wind speed within a wind farm. We found a possible bug since the computed average wind speed is much smaller than the instant one, which drew our attention.

After checking the source code in /applications/solvers/incompressible/windEnergy/windPlantSolver.ALM/computeAverageFields.H, we made modification as follows and obtained a result that seems reasonable.

Line 15: Change UAvg = (UAvg avgTimeSum) + (runTime.deltaT().value() U); to UAvg = (UAvg (avgTimeSum - runTime.startTime().value())) + (runTime.deltaT().value() U); Line 27: Change UAvg = UAvg / avgTimeSum; to UAvg = UAvg / (avgTimeSum - runTime.startTime().value());

We hope to make sure whether it is really a bug, or it is just that we are not using your software in the right way. Looking forward to hearing from you.

Sincerely, Tannan

ZY2xlllz commented 2 years ago

Hello, I also find that the average speed of my calculation is very small. Do you know the reason? Is it a bug? Looking forward to your reply. Thank you very much.

xxh0523 commented 2 years ago

Hello, I also find that the average speed of my calculation is very small. Do you know the reason? Is it a bug? Looking forward to your reply. Thank you very much.

Hi. We think it might be a bug. So we modified the source code as we mentioned in the issue. You could try it and see if the results become reasonable.

ZY2xlllz commented 2 years ago

Thank you very much for your reply. I will try using your code. Wish you success in your research

xxh0523 commented 2 years ago

Thank you very much for your reply. I will try using your code. Wish you success in your research

You too.