PREDICTIVE MODELING OF CHEMICALLY REACTING FLOWS IS ESSENTIAL FOR THE DESIGN AND OPTIMIZATION OF FUTURE HYPERSONIC VEHICLES. DURING ATMOSPHERIC RE ENTRY COMPLEX FLOW STRUCTURES FORM AROUND THE VEHICLE SURFACE EXCITING THE GAS MOLECULES AND CAUSING CHEMICAL REACTIONS. THIS WORK SEEKS TO DEVELOP A MULTI-SCALE MODEL FOR CHEMICALLY REACTING GAS MIXTURES WHICH WOULD HAVE AN IMMEDIATE AND PROFOUND IMPACT ON APPLICATIONS INVOLVING ENTRY DESCENT AND LAND EDL AND THERMAL PROTECTION SYSTEM TPS DESIGN. SIMULATION OF THESE FLOW STRUCTURES USE HYBRID APPROACHES WHICH MODEL THE GAS DIFFERENTLY ACCORDING SPATIAL REGION CONSIDERED. FAR FROM THE VEHICLE SURFACE THE GAS FLOWS ARE SMOOTH OR EQUILIBRIUM AND CAN BE MODELED USING CONTINUUM FLUID EQUATIONS. CLOSER TO THE VEHICLE SURFACE THE FLOWS BECOME MORE COMPLEX AND ARE CALLED NON EQUILIBRIUM. THIS REGION IS MODELED USING STATISTICAL TECHNIQUES THAT TRACK GAS MOLECULES INDIVIDUALLY. AT THE VEHICLE SURFACE IT IS ALSO DESIRABLE TO SIMULATE THE INTERACTIONS OF THE GAS MOLECULES WITH THE SOLID SURFACE. THESE TYPES OF INTERACTIONS ARE DEPENDENT ON THE MICROSCOPIC CHARACTERISTICS OF MOLECULES AND ARE SIMULATED IN MOLECULAR DYNAMICS SOFTWARE. UNDERSTANDING THE NATURE OF THE GAS FLOW IN THESE THREE REGIONS IS KEY TO CHARACTERIZING THE BEHAVIOR OF THE GAS AROUND THE VEHICLE.