Thank you Aitor!!! My feeling is the axisymmetric formulation should be valid for any coordinate axis? In my model I have assigned gravity to the X coordinate which is the axis of the pipe. At this point I only have one phase in the pipe with no liquid/gas interface. Turbulent flow in the pipe, without gravity, has been calibrated with an analytical solution. I thought that I could simulate the effects of pipe inclination by manipulating the gravity vector rather than building a new geometry for each inclination.
Thank You!!!