Suggestion to replace tensor J with symmTensor J in momentOfInertia class
The moment of inertia tensor is always a symmetric 3x3 matrix.
I therefore suggest replacing all occurrences of "tensor J" with "symmTensor J" in: https://develop.openfoam.com/Development/OpenFOAM-plus/tree/develop/src/meshTools/momentOfInertia
I have not encountered problems with the current implementation, but the change will make the code more mathematically consistent.