In #222 FEniCS was added as a solid participant to the elastic-tube-3d tutorial case. A watch point was also added on the solid tube to check the displacement in the center of the tube. The results for CalculiX and FEniCS coupled with OpenFOAM are as follows:

It is evident that the results radial displacement differ greatly on whether CalculiX or FEniCS is used. I think this is the case because of the choice of the elements and also the solvers in CalculiX and FEniCS. The CalculiX participant has C3D10 elements. For the FEniCS participant we use the Cylinder function to construct the geometry. The FEniCS version we use offers very little control over the type of elements we can have, especially when we use in-built geometry constructing functions. In FEniCS-X there is greater control over the choice of elements.

This needs to be investigated further and eventually resolved.