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Hello,

I am trying to develop a local cylindrical coordinate system in a helix geometry where the longitudinalzdirection is along the path of the helix, the radial directionrextends radially outward from the center of the helix's minor radius and phi is orthogonal to both. I used the Curvilinear Coordinates Adaptive Method on a helix to obtain a local cartesian coordinate system and used those results in the built-in Cylindrical System defined in the definitions. The cylindrical system appears have problems with the the helix basis vector inputs for the longitudinal and phi directions. I previously implemented the same idea of using the Adaptive Method results in the Cylindrical System on a cylindrical geometry with good results, however, there seems to be a problem with curved basis vectors. Would anyone know how to implement a local cylindrical system, preferably using the Cylindrical System. I am using COMSOL 5.4.