الملخص

The Fluid Flow in a bend Duct equation had been solved numerically by using two methods. The first is ADE (Alternating Direction Explicit) method and the second is ADI (Alternating Direction Implicit) method. A comparison had been made between these two methods with the  exact solution,  and we find that the ADI  method is the best and most accurate than the ADE method, the numerical solution is alternant and identical. This means that the solution is itself in every period. Therefore, we need lesser accounts and then to a short time.