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Combining rotatingMotion + displacementLaplacian

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Old   September 17, 2021, 11:03
Exclamation Combining rotatingMotion + displacementLaplacian
  #1
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Ege Batmaz
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I would like to simulate a morphing VAWT (Vertical Axis Wind Turbine). I need to combine rotatingMotion and displacemetLaplacian where rotatingMotion is for the Rotor and displacementLaplacian is for the morphing.

Without combining them they work perfectly. However, after combining both functions I am getting the error below:

Code:
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4  Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
#7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/pimpleFoam"
#8  Foam::fvMatrix<double>::solve() in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/pimpleFoam"
#9  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/pimpleFoam"
#10  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11  ? in "/opt/openfoam8/platforms/linux64GccDPInt32Opt/bin/pimpleFoam"
I am also sharing my dynamicMeshDict:

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

/*
dynamicFvMesh dynamicMotionSolverFvMesh;

solvers
(

	Rotor
	{
		motionSolverLibs ("libfvMotionSolvers.so");

		motionSolver            solidBody;

		cellZone		rotor_MRF_zone;

		solidBodyMotionFunction  rotatingMotion;

		

		origin	(0.02145 -0.515 0.00429);
		axis	(0 0 1);
		omega       43.689;

	}

	Morphing
	{

		motionSolverLibs ("libfvMotionSolvers.so");

		motionSolver displacementLaplacian;

		diffusivity  quadratic inverseDistance 1 ("(wing.*)");

	}

);
I am currently using OpenFOAM v8.

Do you have any suggestions?

Best Regards,

Ege
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Old   September 17, 2021, 22:30
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Is there any reason why you want to use mesh morphing instead of sliding mesh method? I am not an expert but I think for full rotations you might be better off with either sliding mesh, overset mesh or automatic remeshing. That's just my opinion though! I am working on something similar to a VAWT.
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Old   September 18, 2021, 03:25
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Ege Batmaz
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Quote:
Originally Posted by erickmartinez View Post
Is there any reason why you want to use mesh morphing instead of sliding mesh method? I am not an expert but I think for full rotations you might be better off with either sliding mesh, overset mesh or automatic remeshing. That's just my opinion though! I am working on something similar to a VAWT.
Hello Erik,

Thanks for the reply! Actually my project is related with the optimization of the wing according to the specific azimuthal degrees. I already have the optimized coordinates of the wing for some time-steps so I need to interpolate between the initial shape to another shape (every mesh point on the wing one by one for example). That's why I want to use "displacementLaplacian" motion solver which makes me able to use "uniformInterpolatedDisplacement" as a pointDisplacement Boundary Condition for specific time-steps. That's why I need to rotate the airfoil (where I am using sliding mesh method) and morph it at the same time. However, I am getting an error when I combine both motion solvers. I've checked the internet a lot but couldn't really found any solution yet.
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Old   September 18, 2021, 06:00
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I don't know about the foundation version, but this should be possible using multiMotion
Code:
dynamicFvMesh dynamicMultiMotionSolverFvMesh; 


// Specification of rotation around centre 
rotation1 
{ 
    solidBodyMotionFunction  rotatingMotion; 
    rotatingMotionCoeffs 
    { 
        origin      (0 0 0); 
        axis        (0 0 1); 
        omega       10; // rad/s, 1rad/s=9.5rpm 
    } 
} 


dynamicMultiMotionSolverFvMeshCoeffs 
{ 
    rotor1 
    { 
        solver solidBody; 
        cellZone rotor; 
        solidBodyCoeffs 
        { 
            $rotation1; 
        } 
    } 

    dualWing1 
    { 
        cellZone dualWing; 

        // Solve displacement on top of solid-body rotation 
        solver solidBodyDisplacementLaplacian; 

        solidBodyDisplacementLaplacianCoeffs 
        { 
            solidBodyMotionFunction  multiMotion; 
            multiMotionCoeffs 
            { 
                rotation_1 
                { 
                    $rotation1; 
                } 
                rotation_2 
                { 
                    // Apply counter rotation to keep dualWing aligned 
                    solidBodyMotionFunction rotatingMotion; 
                    rotatingMotionCoeffs 
                    { 
                        origin      (-0.43 0 0); 
                        axis        (0 0 1); 
                        omega      -10; // rad/s, 1rad/s=9.5rpm 
                    } 
                } 
            } 
            diffusivity quadratic inverseDistance (wing2); 
        } 
    } 
} 


check the tutorials. The above is from the following tutorial mesh/moveDynamicMesh/relativeMotion/box2D_moveDynamicMesh/
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Old   September 20, 2021, 10:07
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Quote:
Originally Posted by Bloerb View Post
I don't know about the foundation version, but this should be possible using multiMotion
Code:
dynamicFvMesh dynamicMultiMotionSolverFvMesh; 


// Specification of rotation around centre 
rotation1 
{ 
    solidBodyMotionFunction  rotatingMotion; 
    rotatingMotionCoeffs 
    { 
        origin      (0 0 0); 
        axis        (0 0 1); 
        omega       10; // rad/s, 1rad/s=9.5rpm 
    } 
} 


dynamicMultiMotionSolverFvMeshCoeffs 
{ 
    rotor1 
    { 
        solver solidBody; 
        cellZone rotor; 
        solidBodyCoeffs 
        { 
            $rotation1; 
        } 
    } 

    dualWing1 
    { 
        cellZone dualWing; 

        // Solve displacement on top of solid-body rotation 
        solver solidBodyDisplacementLaplacian; 

        solidBodyDisplacementLaplacianCoeffs 
        { 
            solidBodyMotionFunction  multiMotion; 
            multiMotionCoeffs 
            { 
                rotation_1 
                { 
                    $rotation1; 
                } 
                rotation_2 
                { 
                    // Apply counter rotation to keep dualWing aligned 
                    solidBodyMotionFunction rotatingMotion; 
                    rotatingMotionCoeffs 
                    { 
                        origin      (-0.43 0 0); 
                        axis        (0 0 1); 
                        omega      -10; // rad/s, 1rad/s=9.5rpm 
                    } 
                } 
            } 
            diffusivity quadratic inverseDistance (wing2); 
        } 
    } 
} 


check the tutorials. The above is from the following tutorial mesh/moveDynamicMesh/relativeMotion/box2D_moveDynamicMesh/
Dear Bloerb,

As you mentioned, I tried it with v1706 and it worked, thanks a lot! If somebody knows how to achieve it with the foundation version, it would be helpful to share just in case.

Kind Regards,

Ege
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