hello.. I wanna simulate about the one stage gas gun (it's a missile launch)

there're Chamber, Launch Tube and Projectile. A projectile get the drive force from a high pressure in the chamber.

when a projectile drive in the launch tube, the pressure in the chamber will may be decrease. and i consider about shock wave.

what do i know if i do this simulation?

have a good day. thank you.

there is a fluent tutorial using coupled solver, compressible flow and dynamic mesh for missile launch.