Solid Rocket Motors Numerical Simulations Using Advanced Eulerian Multiphase Models

Gas–particle flows in aluminum-fueled solid rocket motors strongly affect internal ballistics and overall propulsion performance. This study investigates advanced Eulerian dispersed phase models based on pseudo-pressure closures, which overcome the limitations of classical monokinetic formulations without requiring empirical calibration. The governing equations are implemented in an in-house compressible two-phase flow solver and applied to test cases representing realistic motor geometries and operating conditions. The results demonstrate that the proposed models accurately capture particle dynamics as well as momentum and energy exchange between phases, providing a robust and computationally efficient framework for high-fidelity simulations of solid propulsion systems.