Hovering rotor thrust coeff values
 

Hi,

I have been trying to simulate a hovering rotor case of Caradonna and tung.

I used overset mesh to prescribe rotation (Rigid body rotation) to the rotor blades.

I have obtained thrust coeff value for the case and it is 100% greater than the experimental value. I have even obtained mesh convergence results and have been using a time step of 1 degree rotation.

If anything rings a bell please let me know. I believe I am using right setup as following literature but not sure where its going wrong.

Just to clarify: collective pitch angle of 8 degree means each rotor blade has a pitch angle of 8 degree right ?

Thanks

Hello,

I am working for a while at a VAWT concept and I used the same procedure with overset mesh and DFBI and works well.
I did validated my simulation results with experimental data.

Pay attention that the maximum rotation allowed in one time-step should be max of the smallest cell size from the overset mesh, not 1 degree of rotation.

In the beginning I had problems with with the power output because of the DFBI inertia moments, my input was wrong. I calculated them again and the results improved.

Good day,
dmirel

Why wouldn't Region with Rotation Motion be sufficient for modelling VAWT?

Cwl,

For some people is enough, for others is not but I did not said that is not enough :)

dmirel