Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Periodic Outlet Boundary Conditions ( nonequilibrium extrapolation method) › Reply To: Periodic Outlet Boundary Conditions ( nonequilibrium extrapolation method) March 29, 2023 at 4:09 pm #7326 Henderson_CParticipant Dear Fedor, Thank you for replying. Can you elaborate on the difference between them? Thanks