CFD Online Discussion Forums - sixDofRigidBodyMotion

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:

Code:

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