ESI is an 8(a) firm, specializing in R&D in fluid and structural dynamics modeling, propulsion system/sub-system and component design analysis, control system engineering analysis, aero-thermal/optics system modeling and space/microgravity material processing physics modeling and simulations. ESI's engineering staff has extensive and diverse experience in developing physical models and obtaining solutions for practical aerospace propulsion systems which may require modeling of physical processes such as fluid dynamics, turbulence, combustion, structural dynamics, particulate multi-phase fluid dynamics and heat and mass transfer etc. The company has established capabilities in: Computational Fluid Dynamics (CFD) code development and analyses of complex fluid flow problems Rocket engine preburner, combustion chamber and nozzle flowfield analyses (steady-state and transient) including system analyses and performance predictions Hydrocarbon/Hydrogen fueled gas turbine combustor combustion analyses with finite-rate chemistry Multi-phase and multi-component particulate flow models for spray combustion and solid rocket motor applications Turbomachinery steady-state and transient flowfield analyses High energy shock tunnel real gas flow simulations Hypersonic blunt bodies flowfield analyses with film cooling heat transfer effectsand aero-optics performance predictions