A five-equation model for the simulation of miscible and viscous compressible fluids

- Derives a five equation model for compressible miscible fluids incorporating species diffusion.
- The model advects contact surfaces between gases of differing ratios of specific heats without spurious pressure oscillations.
- A stable and accurate discretization of the governing equations is presented and verified using several benchmark cases.
- There is a substantial reduction in computational effort for a given error when compared to the standard mass fraction model
- It is an extremely attractive formulation for resolved computations of compressible mixing.