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Dynamic Mesh issue when coupling OpenFOAM with FSI

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Old   May 12, 2020, 07:19
Default Dynamic Mesh issue when coupling OpenFOAM with FSI
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Conor
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Hi there,

While trying to run a simple FSI model, coupling Openfoam with Calculix with preCICE, I am encountering a problem with the dynamic mesh.

I am modelling the deflections on a single foil of a VAWT and the model is simplified to contain only a single foil rotating around a center point.

I am using a solidBody solver to define the rotating motion and a Laplacian for the foil deflection.

Before trying with FSI, I modelled as CFD only and the mesh moved as intended i.e. sliding. However, when tried with the FSI settings enabled, the mesh does not slide. It stretches and contorts. See attached pics.

Does anyone have a solution for this?

FYI, Openfoam 7 now allows the coupling of multiple motion solvers.

Many thanks in advance,
Conor

My dynamicMeshDict:

Code:
dynamicFvMesh  dynamicMotionSolverFvMesh;
motionSolverLibs ("libfvMotionSolvers.so");
solvers
(

	Turbine
	{
		motionSolverLibs ("libfvMotionSolvers.so");
		solver solidBody;

		solidBodyCoeffs
		{
   		 	cellZone        rotorVolume;
    			solidBodyMotionFunction  rotatingMotion;
    			rotatingMotionCoeffs
    			{
     			 origin		(0 0 0);
      			 axis		(0 0 -1);
     		 	 omega       5.625;
   			}
		}
	}

	Foil
	{
		motionSolverLibs ("libfvMotionSolvers.so");
		solver displacementLaplacian;
		

		

		displacementLaplacianCoeffs 
		{

   		diffusivity quadratic inverseDistance (foil1);

		}
	}





);
Attached Images
File Type: png Before FSI - correct.png (47.4 KB, 9 views)
File Type: png FSI enabled - incorrect.png (70.8 KB, 9 views)
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calculix, fsi, precice

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