I am currently using olb-1.4 and I am curious if there are any reference papers available about the theory behind setRegularizedTemperatureBoundary or setAdvectionDiffusionTemperatureBoundary. I would like to gain a better understanding of these concepts.
you might want to consider the book of Krüger et al. (2017) in Section “8.5 Boundary Conditions” and references therein.
Please also note that some specific modifications in the OpenLB code might be of practical nature and not explicitly explained in the comments.