Abstract: In order to study the complex aerodynamic problem in multi-warhead projection, and also establish the practical analysis method for nonlinear aerodynamic characteristics, the separation process was simulated by using CFD technology as well as Monte Carlo method for a statistical research, while effects of the projection condition, multi-body intervene and unsteady characteristic during the separation process were discussed. The present research shows that the main forms of the submunition movement are radial separation and pitching movement; the direction of mass center motion and attitude motion is determined by the projection condition, however the attitude motion is also sensitive to aerodynamic effects especially the shock effects from the dispenser; the interference correction model has been established according to the numerical results of typical conditions and this model is proved to be in a good performance; the statistical results obtained by the Monte Carlo method are consistent with the theoretical analysis conclusions.

Key words: CFD, multi-warhead projection, multi-body interference, unsteady flow