Initial trajectory numerical simulation of air launched missile

When a missile is launched from aircraft, its flow field will be disturbed, so its initial attitude and trajectory are influenced. To determine its initial trajectory parameters, this paper uses CFD software to compute the unsteady flow field of the missile at the beginning of launch from aircraft and embed six degree of freedom ballistic equation through the software's interface. So, we have computed the missile s both unsteady aerodynamic force and initial trajectory at the same time. The result shows clearly the separate course of aircraft and missile, and an interfered flow field range can be estimated assumably.