Defining what the firm does as "simulation science", Illinios Rocstar LLC builds the tools, nfrastructures, and interfaces designed to enable industry to gain a return on their investment from using scientific modeling and simulation to improve their processes and products. From macroscale multiphysics that couple fluids, solid mechanics, materials, and chemistry to microscale crystal-level modeling of a variety of granular materials, Illinois Rocstar has tools to help address these areas. Management are experienced senior scientists using advanced computation and simulation techniques supporting the vision that high-fidelity scientific modeling and simulation will enhance nations security and economic position while minimizing cost and physical risk. The firm's principals develop advanced multiphysics software to solve difficult engineering problems in applications from solid propellant rocket performance to ultra-high-performance-concrete microstructure. Focusis on development of high quality open-source and propriety scientific software for high-fidelity numerical analysis of fluid flows, combustion, materials, structures, and their interactions in complex, changing geometries.