Flow driven Vertical Axis Wind Turbine

[18010408BMQU2]

I am working on CFD simulation of Vertical axis wind turbine. For this I have assign the related material. And assigned the boundary conditions as:

Inlet velocity: 15 km/h , Outlet : Pressure = 0 Pa

Initial condition: Pressure= 1 atm, Temp = 40 deg cel

I have applied Angular motion and selected Flow driven unbounded option.

But in results the turbine is not rotating completely, It only rotates half way then again comes back to its initial position.

[KubliJ]

Hi @18010408BMQU2 

Your fluid mesh in the sweeping path of the 'blades' needs to be smaller than the thickness of the blades to get appropriate behavior. Elements are not fully disabled unless they are completely within the moving volume. Which is going to make the model impossibly large to get a mesh density correct enough for that model.

I recommend using a rotating region instead of angular motion. The rotating region can be set to free spinning, and you can put a back force on the turbine to simulate energy generation.

You will also want to widen your flow path. You are likely artificially choking the flow, which is going to create a higher pressure drop and flow speeds than would be accurate.

Thanks,

James

[18010408BMQU2]

Thanks, @KubliJ For your Recommendation.

[18010408BMQU2]

In the attached animation video 1, I have Increased the size of the enclosure after that the blades are moving but as we see there is zero velocity near the sides of an enclosure, velocity is varying only in the center. Why it is showing like that? any suggestion?

(Same boundary conditions.)

And also, I have done the same that was suggested by  KubliJ i.e by taking Rotating Region and applying free-spinning condition, but the blades are rotating in the wrong direction. 

[bob.schlosser]

Just from the picture it seems your air domain should be much larger. Wall effects may limit the air flow.

[KubliJ]

Hi @18010408BMQU2 

Check out a video of my attempt at your vertical axis wind vane. I did it in 2D for speed.

Attached is also my 2D model for reference.

One of the challenges I ran into were save intervals. The first time I ran they were too large once the vane got spinning make the rotation look odd.

Thanks,

James

[18010408BMQU2]

Thanks, KubliJ, Can you tell me the CPU configuration required for smooth CFD Simulation.

[KubliJ]

Hi @18010408BMQU2 

Here is the suggested system requirements.

Thanks,

James

[Jose_Manuel_C]

A query as is the configuration that I used for the solver before starting the simulation?

Thanks