Reply To: BounceBack boundary
Bounce back implemented as dynamics in OpenLB (i.e. as a local collision step) provide “fullway” bounce back. “Halfway” bounce back (implemented using a PostProcessor / Streaming modification) reflects the populations during streaming and e.g. requires no solid nodes. Both of them model a boundary mid way between grid points.
You can read more details in e.g. Krüger et al. “The Lattice Boltzmann Method: Principles and Practice” Section 18.104.22.168.