Reply To: For analysis of flow over cylinder or sphere in 2D- How does ANSYS knows it’s sphere or cylinder.

[Rob]

In 2d it's a cylinder. If you model a semi-circle in 2d axi-symmetric it's a sphere (sort of) but you'll not see any asymmetry in the flow.
Differences in values from analytical solutions vary, but are often mesh or comparison related. Ie for the latter are you comparing the same data? The HTC in Fluent for an external wall is for the non-wetted side of the wall: the solver works out the heat transfer on the wet side.