Reply To: Can you tell me the reason why my residual for truncated nozzle analysis is not converging?

[Rob]

We do see the replies but have turned off most notifications because of the number of threads.
Part of the problem is the mesh: you need to avoid sudden jumps in cell size and stretched cells where the flow is changing across the cell. You're right to have a fine mesh near the walls, but you also need to ensure you resolve the jet and any other flow features. You've not stated what the supply pressure is, if it's sonic or subsonic, and if all boundaries are pressure (as opposed to mass or velocity). The latter makes the initial conditions important. The speed also guides the solver choice, Pressure based is good for Mach 2-3 so is most commonly used.