Negative moment while simulating wind turbine
5 Attachment(s)
Hi everyone,
I'm simulating rotating wind turbine and my aim is to find maximum power. Specification: -rated power 6,150 kW, -rated wind speed (inlet) 14 m/s, -rated rotor speed 12,1 rpm (rigid body motion). I'm getting good thrust value (about 4300 kN), but torque value is negative (about -30 MNm) what is non acceptable, it should be about 5 MNm. I have tried many things (refine mesh, size domain etc). I think the problem may lie in wrong defining moment report. What should be my coordinate system for moment report? Local coordinate system which I have placed in the center of rotating plane? Please help me.:( Attachment 51189 Attachment 51192 Attachment 51193 Attachment 51194 Attachment 51195 |
What does your residual plot look like?
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2 Attachment(s)
The first one with k-epsilon turbulence model, second with k-omega SST.
On the second one, there is a change in values of residuals in 5s (one rotation). And the second one simulation has no tower, only rotor. Attachment 51197 Attachment 51198 |
Why are you plotting residuals against physical time?
Can you share a screen shot of your physics continua? |
1 Attachment(s)
This is how it looks like. I have 5 mln cells in rotating region and 1,8 mln in stationary region.
Time step 0,013(8) s, because 12 rpm, so takes 5 s to complete one full revolution. 5s/360 deg = 0,013(8) s. Don't know where is the problem, I'm beginner with cfd.. Attachment 51201 |
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