The 2-D RSRM geometry at 67 seconds is used for the analysis of the slag behavor in the aft-end cavity using the FDNS (Finite Difference navier-Stokes) code to obtain a better understanding of the relationship between slag behavior and SRM performance. The FDNS flow solver is a finite difference method for solving Navier-Stokes equations using non-staggered curvilinear grid system with multi-zone multi-block option for multiple species to simulate the complex flow problems. A Lagrangian-Eulerian particle tracking method is employed in the FDNS to provide effects of momentum and energy exchanges between the gas phase and the particle phase. The particle trajectories are claculated using a one-step implicit method. The VOF (Volume of Fluid) method is employed to investigate the slag behavior in the aft-end cavity of the solid rocket motors.
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