[f0208secretx]

Hello,

I'm wondering the actual physical mechanism of a wind turbine, HAWT literally. From a basic physics sense, we already knew that the fluid should do work on the turbine to generate the power. That is, despite the start condition of the turbine, if we consider the steady and stable output of the turbine, it should be fluids who accelerates the blades. The resulting torque is balanced with the friction and the resistance of the generator and therefore provides power. However, both the MRF or sliding mesh method are ACTIVE method from my point of view. In specific, they let the blades rotate actively and then the fluid will got disturbed, generating the colorful flow field you've seen on the screen. In other words, this is actually the blades doing work on the fluids, a compressor it is.

Is it the right way to do it?

I have seen a bunch of master thesis and even the official Fluent News (2001 or 2002 Spring) with the analysis on wind turbines utilize these methods. Is there any one who can explain why they did this? How can it be even possible for draining a sensible results? (it actually did...... But I am not comfortable with this weired mechanism..)

Or should I did it another way, applying the UDF and write the governing equation for the rotating motion and let the pressure distribution drives the blade? It is obviously a much more complexmethod, but with a rather sensible physics.

I think I got something wrong in there. Please help me with the confusion. Thank you.