Thanks for the help last time, Gab.

Hitting my head on a wall here, for some reason CFX doesn't like my geometry. Here's the error:

ERROR #999100159 has occurred in subroutine SET_ZONE_PITCH. Message:

The determined pitch angles in the domain FLUID differ more than the allowed tolerance: First pitch angle: ******** degrees Second pitch angle: 360.000 degrees Allowed tolerance: 360.000 degrees

I've had a few successful rotating ref runs, but this new geometry is causing problems. I'm modeling the entire rotating frame, no periodicity. The mesh is high quality, and I have a sizeable hole in the centre. Basically it's just a rectangular block on a rod (ie, the hole) rotating in a large block of symmetry plane bound water.

Has anyone encountered this before? I've tried specifying the ratio, same error. I've tried specifying the pitch angle, I get a "possible zero radius" error then. I've enlarged the hole to no avail. My rotation axis is in the exact centre of an axisymmetric cylinder.

Any insights would be greatly appreciated!

-Dave

Hi, Dave

Did you set the Frame Change option to 'automatic'? If so, you can change to 'none'. I assume that no pitch occurs in your problem.

Regards!

Gab

It works! Thanks again, Gab.

I guess I misunderstood the Frame Change option.