EOS for a multi-component system

[ver2king]

Within GEOSX, I saw that the EOSsolvers are available for the CO2-H2O system. Following the codes, I also saw the calculations for the density & viscosity. The code I mentioned is in the file below:

https://github.com/GEOSX/GEOS/blob/cadc47703f3936f8cff304a10c7ece9168b4c3cc/src/coreComponents/constitutive/fluid/PVTFunctions/CO2EOSSolver.hpp

However, for other possible multi-component systems (e.g., hydrocarbon-CO2), I only found .hpp files to define such systems and no other files that are relevant to the EOS solvers.

Therefore, please raise a continual discussion here, if I miss the EOSsolver files within GEOSX for multi-component systems, or verify the fact that the solver has not been available in GEOSX.