Fluids

Fluids

Negative torque at high tip speed ratio

    • 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?

    • Rob
      Ansys Employee
      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?
    • 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.
    • Rob
      Ansys Employee
      I suspect one/all of will do a better job https://courses.ansys.com/index.php/fluids
    • ansys_noob
      Subscriber
      thank you
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