*MAT GAS MIXTURE, a new gas mixture model for airbag applications

Recent efforts to model fully coupled CFD-airbag processes have motivated the implementation of a gas mixture model in LS-DYNA. The new model, *MAT GAS MIXTURE, allows the mixing of up to eight different gases. It is designed to conserve the total energy of the system. Kinetic energy dissipated in the ALE advection process is automatically transformed into heat. The article serves as a description of the gas mixture model and of the accompanying keyword commands.