RPM and Torque Analysis for a Flow Driven Wind Turbine

[Anonymous]

Hi,

I am attempting to conduct an analysis of a rotating wind turbine using rotating region. I have followed the tutorial for hydraulic turbines but this does not seem to give me the desired result.

I would like to find out:

1. The Angular Velocity the wind turbine rotor will rotate at with a upstream wind velocity of 5m/s (which I've set as the boundary condition).

I've set the expected RPM of the rotating region but when this is reached, the torque is all over the place. 

also, one thing I have noticed is that if I apply traces, it appears that the flow is traveling in the same direction as the rotor, and not the opposite as it should.

if I attempt to run a free-spinning rotation, with the inertia inputted; the rpm just constantly increases until it reaches an infinite amount which causes the simulation to eventually stop. 

2. After the angular velocity is identified, I would then like to find out the torque so I can calculate the power transmitted from the wind and rotor efficency.

can someone please give me some guidance on this,

any help is much appreciated!

[Anonymous]

Perhaps the CFD motion webinars could help ? 

https://youtu.be/JwqFJST8cxE

and 

https://youtu.be/uRwzdZII-rQ

 or dig up the forum? I guess this wind turbine analysis is not the first one to be done 

[Anonymous]

hi, thanks for this suggestion but I still cant figure it out. I've tried many combinations of setups but I either get a result that exits expectantly because the RPM is infinite or I get a result which is to low to be anywhere near correct.

any further guidance?

[Anonymous]

this was a duplicate reply.

[Anonymous]

I never worked on motion, I can't specifically help on this. I'm just sharing what I think could be helpful. As an alternative, I would read all AKN motion related post, for instance here is year 2018.

https://forums.autodesk.com/t5/cfd-forum/latest-updates-new-knowledge-network-solutions-cfd/td-p/773...

Or here C:\Program Files\Autodesk\CFD 2019\flag list.csv

[Anonymous]

Brother, have you got the right answer and your desired results?
if yes, please share the steps required for the same problem you faced.

[Anonymous]

Hi, thanks for checking in. 

I did figure it out eventually in time for my dissertation submission which recieved a 1st grade.

The prescribed speed method (as shown in the webinar) is the way to go, but requires abit of trial and error to find out the optimun speed. I ran 3 simulations at different low speeds. 

Then I used simaltanious equation calculations to work out the maxium speed for which I confirmed with another simulation.  Was a long process requiring atleast 4 simulations for each wind speed, but got there in the end. 

I will try and share more details later.

Thanks,

Joe 

[Anonymous]

It's really helpful.

I'd love to hear further on this.

Thank you ❤️