[racerter]

Hello fellow CFD peeps,

I studying a propeller blade using the rotating reference frame approach. I have a small rotating domain with my propeller blade in a larger fluid domain. I included images of the domain. I interfaced the two regions with an internal interface and used periodic interfaces to create periodicity.

After having run the simulations, I looked at my velocity vector profiles and it seems like my flow is not rotating at all. I included images of the vector plane normal to the rotation (YZ) and a cross-section of the blade. It seems the flow is both unperturbed and flowing right flow my blade.

I am completely confused about what could have caused this issue and I am open to any advice for it.

Domain.png

Domainnear.png

vectoryz.jpg

bladecrosssectionvectors.jpg

[Aeronautics El. K.]

Did you plot them on the stationary or the rotating frame of reference?

[racerter]

Originally Posted by Aeronautics El. K.

Did you plot them on the stationary or the rotating frame of reference?

So sorry for the late reply, I had no clue I got a response to this.
I am not sure what you mean by did I plot them in the stationary or rotating reference frame? Do you mean the velocities?

[Aeronautics El. K.]

Originally Posted by racerter

So sorry for the late reply, I had no clue I got a response to this.
I am not sure what you mean by did I plot them in the stationary or rotating reference frame? Do you mean the velocities?

No worries!

If memory serves you can plot the velocity vectors using either the lab coordinate system or the rotating. I'm not 100% though.

[racerter]

Originally Posted by Aeronautics El. K.

No worries!

If memory serves you can plot the velocity vectors using either the lab coordinate system or the rotating. I'm not 100% though.

Thanks alot for the info, it took me a bit to get it but indeed I see the velocity vectors.

I was wondering if by any chance you also know if the thrust output of a periodic domain is that of the single blade or the hypothetical entire propeller? Now that I am certain my propeller rotates I noticed I am getting over 1kN of thrust per blade and that is impossible for a blade that is specified for 300N (or any normal blade tbh) 0.0

[Aeronautics El. K.]

Oh I'm not sure to be honest.
The reason I'm not sure is that I think that Siemens has added some reports which can give you the value for the whole thing.
Again, that's not something I've used and I might even be making this up but I think I read that in some newsletter.
Check the help for the report you used.

[racerter]

Originally Posted by Aeronautics El. K.

Oh I'm not sure to be honest.
The reason I'm not sure is that I think that Siemens has added some reports which can give you the value for the whole thing.
Again, that's not something I've used and I might even be making this up but I think I read that in some newsletter.
Check the help for the report you used.

Alrighty, Ill look into it, thanks again for your help! You saved me a lot of headache

[Aeronautics El. K.]

No problem! Sorry I couldn't be more precise.
Have fun!

[racerter]

Originally Posted by Aeronautics El. K.

No problem! Sorry I couldn't be more precise.
Have fun!

You have nothing to be sorry about you saved me so much time
I think I will run an unsteady rigid body simulation and see if I get similar answers, because I cannot fathom how I could have messed up my simulation.

Thanks again