An original method has been developed by ONERA-Lille to study the fluid/structure interaction problem of hydraulic ram pressure generated by bullets penetrating fuel tanks. The basic idea consists in modeling the bullet by an equivalent conic projectile, the radius of which (not the tumbling angle) varies accordingly to a reference drag coefficient evolution. Using such a conic shape enables to refrain numerical instabilities and compute the kinematics with classical lagrangian FE explicit codes. The point is then to define the reference drag coefficient data for various initial impact obliquity and velocities. A numerical method is proposed to alleviate the difficulty of measuring experimental data. The equivalent projectile once defined, it is used to generate ram pressures inside the fluid and study the container behavior with or without free surface and for different materials.

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