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Reply To: Pressure in multicomponent LBM


Hi Azmir,

please be aware that thermodynamically speaking, in a multicomponent mixture, there are no “partial pressures”. The partial pressure is just a simplification of a component’s fugacity in the mixture which is related to the component’s chemical potential. I would recommend to derive a free energy (Helmholtz energy) from the bulk pressure term you showed above and then derive chemical potentials for components 1 and 2. As you are using the pseudopotential model, you need to take into account how the psi_i are a function of the rho_i.
All in all, this looks like another mixing rule for a multicomponent equation of state.

Kind regards