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Negative moment while simulating wind turbine |
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October 19, 2016, 06:59
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Negative moment while simulating wind turbine
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#1 |
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New Member
Angelika
Join Date: Jun 2016
Posts: 3
Rep Power: 9  |
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.  domain.jpg Torque.jpg turbina wiatrowa 1 - nowy kat 1_Q Monitor Plot.png Thrust.jpg turbina wiatrowa 1 - nowy kat 1_Residuals.jpg |
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October 19, 2016, 09:08
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#2 |
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Senior Member
Matt
Join Date: Aug 2014
Posts: 947
Rep Power: 17 |
What does your residual plot look like?
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October 19, 2016, 09:24
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#3 |
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New Member
Angelika
Join Date: Jun 2016
Posts: 3
Rep Power: 9 |
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. turbina wiatrowa 1 - nowy kat 1_Residuals.jpg turbina wiatrowa 1 - unsteady - nowy kat 3 v=14 I=18_Residuals.jpg |
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October 19, 2016, 09:26
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#4 |
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Senior Member
Matt
Join Date: Aug 2014
Posts: 947
Rep Power: 17 |
Why are you plotting residuals against physical time?
Can you share a screen shot of your physics continua? |
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October 19, 2016, 09:33
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#5 |
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New Member
Angelika
Join Date: Jun 2016
Posts: 3
Rep Power: 9 |
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.. resiudua.jpg |
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