New to LBM and OpenLB? Attend our upcoming one-week hands-on Spring School in Marseille/France from 19.05.2025 – 23.05.2025. OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Free surface boundary conditions › Reply To: Free surface boundary conditions April 10, 2023 at 6:04 pm #7390 mathiasKeymaster That is what pressureBC is doing.