An interior trajectory simulation of the canister launched missiles has been developed with the help of FLUENT. One of the special features of this simulation is the method by which the coupled three-phase problem is reduced to solving the fluid equations only. Several new source terms describing the influence of droplets and particles on gas have been created in the present case and added to the motion equations and energy equations of the gas. According to the simulation, the almost uniform

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... celeration occurs 0.25s after startup and indicates that the missile is shockless during ejection. The calculation has been done efficiently in FLUENT after setting all the required parameters. Several figures obtained from the simulation show the velocity and pressure of the flow field in the reservoir. The distribution curves of the velocity and acceleration show that the simulation and the test data of the experiments are in good agreement with each other. This model satisfies the requirements of the missile ejection and can be used to analyze the similar launch procedures.