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Custom boundary condition rotation angle access

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Old   February 11, 2022, 13:23
Post Custom boundary condition rotation angle access
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Adrian del Ser
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Hi everyone,


I'm trying to create a custom codedFixedValue boundary condition that depends on the angle of rotation and angular velocity of a rotating rigid body. The motion solver is sixDoFRigidBodyMotion.



Inside controlDict, one can add the following code to print out this data:



Code:
functions
{
    sixDoFRigidBodyState
    {
        type           sixDoFRigidBodyState;
        libs           ("libsixDoFRigidBodyState.so");
        angleFormat    degrees;
    }
}
How could I access (during runtime of course) the rotation rate/rotation angle or other data contained in sixDoFRigidBodyState as variables to code into the codedFixedValue boundary condition? I have tried to follow the class tree without success.



I have found this code which gets access to db() or patch() to set a sinusoidal boundary condition in space, but I am not sure how to get to sixDoFRigidBodyState and the values it contains:


Code:
codedPatch
    {
        type            codedFixedValue;
        value           uniform 0;


        name    codedPatchBC;   // name of generated BC

        code
        #{
        //const scalar t = this -> db().time().value();
        const scalar pi = constant::mathematical::pi; 
        const fvPatch& patch = this -> patch();
        const vectorField& cf = patch.Cf();         
        const scalar l = 0.1;
        scalarField& field = *this;
        forAll(cf, i)
        {
            field[i] = 273+100*sin((2*pi/l)*cf[i].x());
        }
        #};
Thanks,


Adrian
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Old   February 12, 2022, 03:11
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Michael Alletto
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From this file it seems you have to access the motion solver
https://develop.openfoam.com/Develop...gidBodyState.C

The the function motion() returns the motion state

Best

Michael
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Old   February 12, 2022, 03:17
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Michael Alletto
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Probably you have to write this lines in your function object

Code:
. const sixDoFRigidBodyMotionSolver& motionSolver_ =
        refCast<const sixDoFRigidBodyMotionSolver>(mesh.motion());

    const sixDoFRigidBodyMotion& motion = motionSolver_.motion();
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Old   February 17, 2022, 04:11
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Adrian del Ser
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Quote:
Originally Posted by mAlletto View Post
Probably you have to write this lines in your function object

Code:
. const sixDoFRigidBodyMotionSolver& motionSolver_ =
        refCast<const sixDoFRigidBodyMotionSolver>(mesh.motion());

    const sixDoFRigidBodyMotion& motion = motionSolver_.motion();

Thanks! I'll be testing this soon, is this something you can put directly in the code block of the custom boundary condition?
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Old   February 17, 2022, 12:09
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Michael Alletto
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Yes yes. You have to access the value at the boundary
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