OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Velocity boundary conditions › Reply To: Velocity boundary conditions May 18, 2021 at 4:40 am #5675 GloriousfaceParticipant Thank you very much for your reply. In fact, the oil-water two-phase density I simulated should be fixed. I have some questions about the speed setting, T distance2Wall = 0.1; What is the function of distance2Wall?