Prandtl Torsion
This tutorial demonstrates the finite element solution of the Prandtl stress function for the torsion of prismatic bars. The Prandtl formulation transforms the torsion problem into a scalar Poisson equation, making it an elegant example of the close relationship between elasticity and potential problems.
The tutorial covers the complete workflow, including mesh generation, material properties, boundary conditions, solution of the Prandtl stress function, and visualization of the resulting shear stress distribution.