[jumpa72]

HI,
I'm simulating a crossflow turbine. I'm using interDyMFoam and sixDofRigidBodyMotion to simulate the rotor.
The simulation runs fine, the rotor starts correctly moved by water, but
I have a problem: the rotor continues to accelerate until the escape velocity, given by the water head (omega=c/r where c = sqrt(2gh)).
I wish the rotor would stop speeding up and starts rotating at a constant speed, equal to power grid synchronous speed.
This is my dynamicMeshDict:

sixDoFRigidBodyMotionCoeffs 
{ 
    patches         (pala); 
    innerDistance   1e5; // Extent of the solid-body motion region around body 
    outerDistance   1.1e5; // Extent of mesh-morphing region around body 

    centreOfMass    (0 0 0); 
    mass            2; 
    momentOfInertia (0.06 0.06 0.005); 
        orientation
        (
            1 0 0
            0 1 0
            0 0 1
        );
    velocity        (0 0 0);
    acceleration    (0 0 0);
    angularMomentum (0 0 4.3);


    report          on; 
    accelerationRelaxation 0.3; 
    value           uniform (0 0 0); 

    constraints 
    { 
        zAxis 
        { 
            sixDoFRigidBodyMotionConstraint axis; 
            axis          (0 0 1); 
        }
    fixedPt
    {
        sixDoFRigidBodyMotionConstraint point;
         point    (0 0 0);
    }
         
    } 

    restraints
    {
        rotationDamper
        {
           sixDoFRigidBodyMotionRestraint sphericalAngularDamper;
           coeff         0.1;
        }
    }

}

I've tried giving or not angularMomentum, but I have always the same result.
I don't know how to give the maximum rotational speed...
Is there a way to set this speed?

Thank you
Gianpaolo

[jumpa72]

Any Ideas?
Thank you!