Helix around a curve. For example half circle.
I am running a project for a CFD simulation of fluid flow inside an internally helical ribbed tube ( Rifled technology - tube) of a compact heat exchanger, where the tube would be bent 180 degrees.
I know how to draw a helix twisted a long straight curve using SpaceClaim. But how can I sweep a helical surface around a curved path rather than a straight line, or draw a helical 3D curve around another curved path?