[Pervispasco]

Hi everyone,

in the next few months I'm going to simulate a 2D VAWT with openfoam. I would like to do both steady state and unsteady simulations. I have already clear how the sliding mesh technique is implemented in openfoam, but I'm still struggling with the MRF steady approach.

To have a better understanding of the problem I decided to replicate the mixervessel tutorial from scratch.

I copied the case folder and deleted the original mesh. I created an identical copy with gmsh software using an unstructured mesh.



I defined a rotor volume including the 4 internal yellow zones and a stator volume with the remaining 4 yellow areas.

You can see the original mesh and my variation in the following pictures:




I defined the different patches as per the original tutorial case.

I ran the simulation for both case and the original converged around 700 iterations faster than my variation (residuals 10e-4).

Comparing the results i got similar values for U while for all the other variables i very different behaviour (I.E the pressure field in the next picture):




Is there something I'm missing in the definition of the rotor regions by MRF file?

Thanks in advance for any suggestion.