I’m not sure to understand what is your problem. Do you want to interpolate off lattice fluid fields values at solid/mesh points? Or are you talking about boundary condition? Can you put the link to the references you mentioned?
Very thank you for your reply, and for the last reply.
Yeah, what I do is separate the domain to two lattice. And I need to reconstruct the f_i at the interface surface. Now, I already get a large step in it. But what I would like to know is is there already have compact quadratic interpolation in PALABOS? Or I need to do it myself.