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Strange observation in torque values for a Wind Turbine |
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February 28, 2022, 03:56 |
Strange observation in torque values for a Wind Turbine
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Pranjal Anand
Join Date: Feb 2022
Posts: 1
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Hi,
I am simulating a HAWT (horizontal axis wind turbine) , specifically NREL Phase VI blade with a slot to help in passive boundary layyer control . I am simulating just one blade with a moving reference frame as was used in my primary article of reference. As I keep adapting mesh count based on y+ values the torque value (obtained from moments menu in reports) keeps going down, and significantly, moving further from the desired value. It was ~ 120 Nm at the count of 1.5M cells, and when increased to 9.2 M, it was 90 Nm. I dont understand how refining the mesh can lead to less accurate results. I am using a tet mesh with no inflation layers as ANSYS meshing was creating bad quality elements when I tried to. I am using the SST k-omega model, and by refining the mesh I expect to get more accurate results. Is the lack of an inflation layer the problem here? Or, is it the slotted geometry(which might need a very refined mesh?)? Considering that I do not have ICEM CFD, is there a way to make a better mesh if that is the problem? |
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Tags |
mesh adaption, wind turbine blade |
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