Reply To: Multicomponent flow
to ensure that the flow problem is well-posed please have a look at the standard literature (see Krüger et al. 2017 “The lattice Boltzmann method” or Huang et al. 2015 “Multiphase Lattice Boltzmann Methods: Theory and Application” and references therein).
Also, please start with “ideal” parameter settings (e.g. low Reynolds number) to prevent numerical instability (see e.g. Krüger et al., Chapter 9).
As such this is currently all I can do, since it is hard to tell where the issues are without going into detail.