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 29, 2023 at 4:20 pm #7329 FBukreevKeymaster Look in the examples/particles/bifurcation/eulerLagrange and eulerEuler. There you can see it clear.