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cfd.eng February 18, 2015 09:33

problem with torque using sixDoFRigidBodyMotion
 
Dear all,

I'm using waveDyMFoam solver with sixDoFRigidBodyMotion option, to study a rotating device moving in water.
I would impose a constant torque to the shaft: I added the line with torque string in the "dynamicMeshDict" file , but it seems that the defined torque is used only as an initial condition and not as a constant value imposed.
Anyone know the reason of the error and how to fix it?

Many thanks in advanced.


Code:

sixDoFRigidBodyMotionCoeffs
{
    patches            (rotatingWalls);
    innerDistance          0.3;
    outerDistance          1;

    centreOfMass            (5.0 -0.14 0.0);
    mass                    0.000432;
    momentOfInertia        (0.0 0.00000023 0.00000023);
    orientation
  (
    1 0 0
    0 1 0
    0 0 1
    );

    torque            (0 0 1);
    rhoName                rhoInf;
    rhoInf                  1000;
    report                  on;
    accelerationRelaxation    0.08; // 0.1;
    value                  uniform (0 0 0);
    g (0 -9.8 0);

    constraints
    {
    rotationAxis
        {
        sixDoFRigidBodyMotionConstraint axis;
        axis                      (0 0 1);
        }
    fixedPoint
    {
            sixDoFRigidBodyMotionConstraint point;
        centreOfRotation        (5.0 -0.1 0.0);
    }
    }


mxylondon April 12, 2019 06:31

I think it should be defined under entry 'Restraints'.

However I am not sure how to make the resistant torque constant.

DouglasFreds February 2, 2020 05:52

problem with torque using sixDoFRigidBodyMotion
 
Hi everyone,

I am having a problem using matlab in openvibe. I followed the steps mentioned in the tutorial but still getting an error.

For example, when trying to implement tutorial 2, this is what I get.

What do you think??


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