[nomad2]

Has anyone simulated rotating bodies such as propellers using the unsteady, compressible, navier stokes model (SA or SST turb models)?

Would a rigid body motion, deforming mesh or moving wall work best?

So far, I haven't seen convergence of my simulation with any of the above in a simple hover (static) condition. I've tweaked CFLs, time steps, internal iteration counts and multi-grid parameters to no avail. Forces diverge after a few thousand iterations and there is no wake developing in the flow.

My mesh is approximately 10M cells with a wall y+ <1 on the surface.

I can run the euler model, but this one's of no use to me since the flow is highly turbulent and unsteady with significant blade vortex interaction.

Thanks.

[hlk]

Originally Posted by nomad2

Has anyone simulated rotating bodies such as propellers using the unsteady, compressible, navier stokes model (SA or SST turb models)?

Would a rigid body motion, deforming mesh or moving wall work best?

So far, I haven't seen convergence of my simulation with any of the above in a simple hover (static) condition. I've tweaked CFLs, time steps, internal iteration counts and multi-grid parameters to no avail. Forces diverge after a few thousand iterations and there is no wake developing in the flow.

My mesh is approximately 10M cells with a wall y+ <1 on the surface.

I can run the euler model, but this one's of no use to me since the flow is highly turbulent and unsteady with significant blade vortex interaction.

Thanks.

Thanks for the question.

I think that the test case closest to what you are describing is the rotation/caradonna_tung case, which uses a rotating frame and gives an example of setting the rotation rates.
In terms of converging, I would suggest first looking at some of the rans test cases for examples of boundary conditions, turbulence models, numerical methods, etc.
If the same mesh converges in Euler, you can also try restarting from the Euler solution.

[hlk]

See also:
Economon, Thomas D., Francisco Palacios, and Juan J. Alonso. "Optimal shape design for open rotor blades." AIAA paper 3018 (2012): 2012.