iiiiiIn this work, two dimensional numerical modeling of two projectiles with various geometries has been carried out in which one projectile with Mach number 2 was pursued by projectile with Mach number 3. A blend of second and fourth differences of the flow variables are used and the utilized grid scheme was a zonal method which separates the flow field into smaller components. Additionally, unsteady fluid stream has been considered turbulent, viscous and compressible. First projectile has been hold constant in the environment with Mach number 2 while the second one was moving towards it with Mach number (-1). The obtained results show that two mentioned projectiles do not leave any effect on each other under the condition that they are located far away from each other. However when the second projectile is located close to the wake of the first one, it is influenced by Mach number less than 2 and consequently formed shock in front of second projectile would become weak. As a result, the streamlines in this region would lose their regularity and the drag coefficient would decrease. A comparison has been performed between mathematical modeling data and the experimental results reported by Kayser L.D. et.al [2] for the first projectile.

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