Vigneswaran Sridharan
Ansys Employee

Hi, 

Try performing a general axisymmetric analysis of the model. This analysis behaves like a 2D-axisymmetric analysis with additional DOF for bending and torsion.

I recommend watching this AIC video to understand how to convert 2D to 3D models.

" target="_blank" rel="noopener">Efficiently Analyzing Structures with a Constant 2D Profile Using Ansys Mechanical 

In MAPDL, use Plt Ctrls>>Style>>Symmetry Expansion>>2D-axisymmetry as an equivalent command to symmetry option in WorkBench.

Other help links:

Performing a 2D to 3D Analysis

Thanks!