CFD simulations of the store separation and its effect on the attitude of the parent vehicle

The present study utilizes compressible flow solver coupled with 6-DOF algorithm to simulate generic store separation events that may include the release of stores from aircrafts, booster/stage separations from missiles and space launch vehicles. A well-documented store separation experimental and configuration data is selected for validation purpose. The chimera based mesh technique is used to translate between the major and minor grids. CFD results for a transient finned-store release from a static delta wing under transonic flow conditions are compared with the experimental results. Both inviscid and viscous flow conditions are considered to simulate the event. And, the results are found within design accuracy limits for trajectory, forces and moments. The simulations are than extended to examine the effect of release on the parent vehicle´s rotational attitude. The simulation methodology is suggested to be reliable in the design process for the estimation of aerodynamic coefficients and trajectories of the child; and angular orientations/rates of both the child and the parent vehicle. The plume effects of the burning nozzles may also be included in the simulation if required with the penalty of huge computational time. The effort is quite helpful in reducing the prototype cost and to predict any possible flight test hazard.