OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Periodic Outlet Boundary Conditions ( nonequilibrium extrapolation method) › Reply To: Periodic Outlet Boundary Conditions ( nonequilibrium extrapolation method) March 30, 2023 at 1:54 pm #7339 FBukreevKeymaster You can add the periodicity vector (false,true) at the end of the ParticleManager, look also at the ParticleManger code in src.