Negative torque at high tip speed ratio

- February 12, 2022 at 2:39 pm
  
  ansys_noob
  Subscriber
  
  Hello, good day.
  I'm simulating a wind turbine, I designed on my own, using ANSYS FLUENT. At tip speed ratio equal to 5 and lower, I'm getting positive torque. However, at tip speed ratio equal to 6 and above, I'm getting negative torque. Since I have frame motion enabled, the wind turbine is "still spinning in the correct direction" but if this was in the real world, I think, negative torque would that the wind turbine is spinning in the opposite direction. What does this mean? Which is the problem; my simulation or design?
- February 14, 2022 at 12:14 pm
  
  Rob
  Forum Moderator
  
  It could also mean the blade is spinning too quickly for the air flow. Have a look at the local flow field, has the tip stalled?
- February 14, 2022 at 2:22 pm
  
  ansys_noob
  Subscriber
  
  Hey thanks for responding. Here's a cut plot (r/R = 0.85) at high tip speed ratio, which has negative torque, but I dont know what to make of it. Would be happy if you can explain it to me.
- February 14, 2022 at 3:00 pm
  
  Rob
  Forum Moderator
  
  I suspect one/all of will do a better job /courses/index.php/fluids
- February 14, 2022 at 4:10 pm
  
  ansys_noob
  Subscriber
  
  thank you