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The OpenFOAM ® toolbox is used to establish two numerical models for the gas-phase phenomena observed during composite solid propellant combustion. The models were identified to evaluate and compare the performance of the pressure-and density-based approaches typically used to simulate the gas-phase phenomena. The pressure-based model is based on the rhoReactingFoam combustion model included in the OpenFOAM ® libraries. The density-based model is based on a vorticity-velocity formulation. Both models include detailed kinetic mechanisms and species transport. The combustion capabilities of the pressure-base model are validated against a known case for piloted methane (CH 4 )/air jet flames. Preliminary validation test results show satisfactory agreement between model predictions and literature data. The model development as well as future work planned is discussed. Nomenclature= effective thermal flux = constant pressure specific heat of the mixture = constant pressure specific heat of the k th species = diffusion coefficient ̅ = acceleration due to gravity = specific enthalpy of the k th species = heat of formation of the k th species at temperature (298.15 K) = sensible enthalpy = pressure = change in energy density due to radiation ̅ = velocity vector ̅ = diffusion velocity vector of the k th species ̿ = identity tensor ̅ = diffusion flux ̅ = diffusive flux vector of the k th species = kinetic energy 1 PhD Student, Department of Process Engineering, eonretief@sun.ac.za, AIAA Member 2 = species flux = number of gas-phase species present in a mixture or chemical kinetic mechanism = place-holder variable = mixture concentration ̅ = heat flux density = universal gas constant = temperature = reference temperature ̅ = average molecular weight of the species = molecular weight of the k th species = mass fraction of the k th species = thermal conductivity = dynamic viscosity = density ̿ = viscous stress tensor ̿ = summation of the viscous and turbulent stress tensors ̅ = vorticity vector ̇ = net molar production rate of the k th species ̇ = enthalpy of formation of the k th specie at temperature (298.15 K) = gradient of a quantity = divergence of a quantity = curl of a quantity