Reply To: Multi-mesh
This is indeed related to grid refinement. SuperLatticeRefinementMetricKnudsen3D implements a refinement criterion [1] to help determine where to refine to which degree. This is one part of a prototype implementation [2] that I pulled into the release as it is also useful in other contexts. e.g. to check whether a simulation gets close to diverging or to identify problematic regions.
[1]: Automatic grid refinement criterion for lattice Boltzmann method [Lagrava et al.]
[2]: Prototype of grid refinement in OpenLB 1.3 written for my Bachelor thesis