[Bluewater]

Dear Foamers,

i am learning how to calculate rotating machines in OpenFOAM. I have a problem with the cyclic boundary condition in the rotor domain. Attached a picture that shows the cross section at the midle of the rotor domain of pressure contour with very high or low (unrealistic) values close to the cycly BC.

Basically I have done the following steps.

1)The mesh I converted to OpenFoam using "Fluent3DMeshToFoam".

2)Then I defined for the cyclic boundary conditions "cyclicAMI" in the boundary file as below

...

p1-rotor
{
type cyclicAMI;
inGroups 1(cyclicAMI);
matchTolerance 0.0001;
transform rotational;
neighbourPatch p2_rotor;
rotationAxis (0 0 1);
rotationCentre (0 0 0);
nFaces 5871;
startFace 6734366;
}
p2_rotor
{
type cyclicAMI;
inGroups 1(cyclicAMI);
matchTolerance 0.0001;
transform rotational;
neighbourPatch p1_rotor;
rotationAxis (0 0 1);
rotationCentre (0 0 0);
nFaces 5871;
startFace 6751983;
}...

3) In the fvOptions the corresponding angular velocity on rotor domain.

MRF1
{
type MRFSource;
active true;
selectionMode cellZone;
cellZone rotor;

MRFSourceCoeffs
{
origin (0 0 0);
axis (0 0 1);
omega 77.5;
}
}

The residuals after 4000 iterations are for pressure just below 10-e3, velocities below 10-e4 and k and omega below 10-e5.

Does anyone knows why my strange results chose to the cyclicAMI boundary condition?

Thanks in advance,
Mat