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 4:07 pm #7325 FBukreevKeymaster Hello, we have particle counter by the Lagrangian particles and the mass counter by Eulerian particles at the outlet. Which one do you want to use? Greetings Fedor