[Alberto Damas]

Hello, I am trying to simulate a wind turbine but I have some troubles.
First, I suppose I have to set the wind speed as an inlet and use the DFBI in order to get the turbine movement. ¿Is this method right? ¿Do I need something more?

About the regions, I have the turbine and its mesh, and a cylinder center in the same point and with the same axis direction. ¿Do I need some region more?

It's the first time I use star ccm, I have done some tutorials but nothing with rotation. I have seen you can set the rotation speed, but it seems to me the natural way is to set the air speed.

Thx.

[pablo_fil]

Hi Alberto.

I have simulated several wind turbines and I've seen 2 approaches.

The first one is doing 1/3 of the turbine, which is cheaper but i don't like it.
I usually do it using overset mesh, where you have to define two regions, the rotating one and the static. This method is really expensive.

I'm doing right now a method using the Fan_mrf tutorial as "base", but instead of giving rotational speed to the reference frame, I activate the dfbi node with just dfbi rotation and translation. With this approach, you also need two regions.

Good luck, have fun, and ask if you don't know how to continue

[Alberto Damas]

Hi Pablo,

I have been working with the DFBI motion because my idea is to set the wind speed as the input. I don't know if I do it well because when I visualize the solution, for instance, the wind velocity, it seems to ignore the turbine mesh because the wind barely change its direction or when I visualize the streamlines their direction don't change.

Your new method seems to be like this, so I will look the tutorial you mentioned but I have two questions more.

Do I need to set some kind of interface between the two regions, the turbine (DFBI) and the control volume around it? Before I was using DFBI with overset mesh creating an "overset mesh interface" but I think this was wrong. I don't know if only using DFBI I have to do something.

Last question, could you tell me the basic steps in order to visualize the movement of the DFBI body? I looked the ship tutorial but it didn't help me enough.

Thank you very much.

[pablo_fil]

Hi Alberto,

With this method, which comes from that fan tutorial, you can use wind speed as an input. The main difference is that instead of giving rotational speed to the reference frame, you create in Tools/Motion a DFBI Rotation movement. That way, air interacts with your turbine and will make it rotate.

You have to define an internal interface. Where? You create 2 regions:

• Rotating: Your turbine substracted to a cylinder.
• Static: A big air volume minus the previous cylinder.

The internal interface are in that faces of the cylinders, between bothe regions.

I don't care about movement, so I can't help you a lot with the video you want to record.

If you have any more questions, you can pm me in order to have a chat if you are from spain.

Good luck