DEVELOPMENT OF A LAGRANGIAN-EULERIAN TWO-PHASE FLOW SOLVER BASED ON FULL NAVIER-STOKES EQUATIONS FOR SOLID ROCKET MOTORS AND JET SHEAR FLOW

摘要

The present work describes new developments in IMI’s Computational FluidDynamics (CFD) code FLDYNS. This program is a multi-purpose Eulerian-Lagrangian CFD code which solves external flows for a large range of Mach numbers(from close to zero to hypersonic flow) and two-phase internal flows in motors forwhich the flow Mach numbers varies from low subsonic to high supersonic.The two-equation turbulence model (k ?ω ) of Wilcox has been added to the Eulerianpart of the code as well as a Lagrangian solver for the particulate phase of the aluminaparticles present in the flow field of the solid rocket motor has been introduced.The solution of the two-phase flow is obtained by first solving the continuous gasphase using our FLDYNS code. The particles are then injected into this flow field,normal to the local boundary and their trajectory is calculated. The solution obtaineddescribes the gas flow field and the particles’ trajectory as a consequence of thepresence of the gas.In this paper we describe the algorithm of coupling between the gas and particleswhich takes into account only the effect of the gas on the particles. A solution of thisone sided coupled solution is presented.Adding complete coupling between the gas flow field and the particles requires alsotaking into account the effect of the particulate phase on the gas flow field, but thispart has not yet been implemented. Computational results for the K ? ω turbulencemodel and two-phase flow are presented.