Abstract: The numerical solution of inviscid and viscous flow through convergent nozzles is presented from Euler equation and N-S equation. MacCormack explicit difference scheme is used with an improved artificial viscous term. The method employs the split of zone to overcome the instability near exit of the nozzeles. The results of a typical calculation are in good agreement with experimental data.

Key words: the flow through nozzles, separation of zone, the solution of Euler Equation, the solution of N-S equation