7. A Levelset-Based Sharp-Interface Modified Ghost Fluid Method for High-Speed Multiphase Flows and Multi-Material Hypervelocity Impact

Multi-material compressible flows are ubiquitous in industrial, defense, and environmental applications. The widely varied range of applications encompasses high-speed multiphase combustion in solid-propellant rocket motors, high-speed manufacturing processes, target–munition interactions, geological impact, and many more. Major challenges in modeling such systems lie in preserving the material interface definition while simultaneously satisfying the interfacial boundary conditions accurately. In this chapter, a levelset-based sharp-interface method is described for general classes of multi-material compressible flows problems. In this framework, the interface definition is retained sharply, while interfacial jump conditions are prescribed through a high-accuracy modified ghost fluid method. The application of the framework is demonstrated for several multi-material flow problems such as shock–particle interactions, shock–droplet interaction, shock-induced void collapse in energetic materials, and shock compaction of metallic powders. The chapter will describe the levelset-based framework for high-speed multiphase flows and shows its application to a broad spectrum of problems of engineering interest.