The Symmetry boundary condition prescribes no penetration and vanishing shear stresses. The boundary condition is a combination of a Dirichlet condition and a Neumann condition:
For 2D axial symmetry, a boundary condition does not need to be defined for the symmetry axis at r = 0. The software automatically provides a condition that prescribes
ur = 0 and vanishing stresses in the
z direction and adds an
Axial Symmetry node that implements these conditions on the axial symmetry boundaries only.
) and selecting