) multiphysics node is used to couple the structural mechanics interfaces to the Pipe Mechanics interface. The Structure–Pipe Connection multiphysics coupling is only available with some COMSOL products (see www.comsol.com/products/specifications/).) multiphysics node is used to couple the structural mechanics interfaces to the Pipe Mechanics interface. The Structure–Pipe Connection multiphysics coupling is only available with some COMSOL products (see www.comsol.com/products/specifications/).