Is the relative motion between the torus and the spar mainly in the spar axial direction after using these fenders? Such large relative motion may also cause the error mentioned above.
If the gap between torus and spar is small (about 1 to 2 times of mesh size), I wonder if you can make the surfaces in the gap (the highlighted parts as shown below) to be non-diffraction?
You are navigating away from the AIS Discovery experience
