Learning Forum

[Maxpay]

Hi, experts,

In Fluent, for the 2D simulation, the dimension of 1m is assumed for the z-direction. So, for the wind turbine with the height H = 1m, it is consistent with the experiment to calculate the torque on the turbine, the torque coefficient, and the power coefficient.

However, for the turbine with a height that is different from 1 m, how to calculate the torque and torque coefficient on the turbine? Because of the 2D simulation, the computed result is independent of the real height of the turbine, isn't this?

Here, I export the torque on the turbine at each time step, not the torque coefficient.

Thank you.

[Federico]

If the real turbine has a height which is different than 1m, the total torque for the full-height turbine should be scaled proportionally.

Aslo, make sure your reference values in Fluent are correct when evaluating the torque coefficient

[Maxpay]

Thank Federico,

You mean that if the real turbine height is H = 1.5 m, the total torque for the full-height turbine should be 1.5 that of the 2D computed data.

However, for estimating the torque coefficient, CT = 4T/Rho/H/D^2/U^. Here H also appears, thus the torque coefficient must be the same for all heights in a 2D simulation.

[Federico]

All other things being equal, yes theoretically the absolute torque should scale with the height factor, while the coefficient should remain the same.

[Maxpay]

Thank you very much Federico.