Abstract: The free flight ballistic range is an important ground test method for the study of hypersonic vehicles. After the accelerated launch, the projectile is separated from the sabots in the range tank. The actual flying posture of the projectile is affected by many factors occurring in the processes of model acceleration and separation. Therefore, it is helpful to operate the experiment by developing simulation techniques for ballistic range tests. Considering the above processes, a set of numerical simulation algorithms is built. More specifically, the unstructured dynamic grid technique and Adaptive Discontinuity Fitting solver(ADFs) are used to track the motion of the projectile and sabots, and the cell-centered finite volume method is utilized to update the flow field.