The Shear stress at wall result has been included for 3D mesh types. This result was already available for Midplane and Dual Domain meshes.
The Shear stress at wall result shows the shear stress at the plastic frozen/molten interface at the time the result was written. Shear stress is a measure of the factors that affect the degree of orientation of the melt next to the frozen layer. Under the viscous flow formulation, shear stress is zero at the center of the cross-section and linearly increases to the frozen/molten interface. Thus, the wall-shear stress could be at its maximum value at any portion of the cross-section.