I am using 2022 R2, Barrel Material is Steel chosen from Fluent Database. Fluid is air. Tried both K-omega and K-epsilon Viscous Models.
Materials:


Boundary Condiitions:
Air with 25 degree celcius temperature and 0.5 Mach Speed

Pressure Outlet
Walls:
Coupled

Method:

Controls (Default):

Patched Temperatur to very thin inner cylinder after initialization