Multiphase Flow Physics for Reduced Order Models
Abstract
We shall conduct a comprehensive study of the fundamental physics relevant to understanding nuclear weapons effects in situations where mixing of multiple gases and interaction between gases and particles/droplets play an important role, for example, in fireballs and shock-debris interactions. The study will combine theoretical analysis, numerical modeling, and experiments in a three-university effort that will result in better understanding and improved modeling of the physics at interfaces and mixing scales of interest. New small-scale models will be incorporated into larger-scale ones to reduce the order of their complexity, while maintaining accurate interface representations. The resulting multiscale reduced-order models will be validated using theoretical and experimental results in a priori testing. Validated models will be incorporated into numerical codes commonly used in the National Laboratories and by weapons developers. Simulations with these models will be conducted in collaboration with LANL researchers. The shock-driven phenomena to be considered include gas mixing and transition to turbulence, complex behavior of particles and droplets, resuspension and transport of flammable materials, and reshock in a variety of geometries. Free-field explosive experiments will investigate the scalability of fireball dynamics to identify and characterize evolution of fractal order for incorporation into blast scaling. These experiments will assist the modeling efforts by experimentally identifying regimes where fundamental interface behaviors change or evolve at different rates.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 16, 2019
- Source ID
- HDTRA11810022
Entities
People
- Peter Vorobieff
Organizations
- Defense Threat Reduction Agency
- University of New Mexico