Reply To: Not clear which version of Shan Chen model is implemented
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there is an actual issue with the rayleighTaylor cases as they use the Shan-Chen post processor, but they use dynamics with the Guo forcing scheme. The model that is meant to be iplemented is the multi-component Shan-Chen model from the Krüger book, where you have the Shan-Chen forcing scheme, see equations 9.125 and 9.126. So one should change the dynamics from “ForcedBGKdynamics” to “ForcedShanChenBGKdynamics” that use the velocity shifted equilibrium, similar to the phase separation cases. This will match the post processor, as there is no addition of F/2 to the velocity in this model which is what I suppose you tried to do with these IdentityForcedBGKdynamics?!
Hope this helps