Influence of elastic deformation on unsteady multi-body separation

A dynamic mesh technique for simulating the dynamics and trajectory of multiple moving bodies is presented. To analyze the influence of the store's aero-elastic deformation on its motion trajectory, radial basis functions were integrated into Chimera grid technique. The code capability was demonstrated by simulation of the 2D release of a missile from a two-dimensional aerofoil. In the case of the navigation of aircraft in low altitude and high-speed flight, the simulation predicted the trajectories of the missile with different aero-elastic deformations, which were compared with the trajectory of rigid missile. The results show that when the aero-elastic deformation reached a critical value, the trajectory of the missile appeared an obvious deviation, and the deviation increased with the augment of the deformation values. Furthermore, if the deformation is periodically, the deformation rate of the missile has an obvious influence on the separating trajectory at a determined deformation value, and the influence is sensitive to the oscillation frequency of the store.