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 › Create new boundary condition › Re: Create new boundary condition August 8, 2018 at 12:26 pm #2904 mathiasKeymaster Dear Eric, addPressureBoundary does the job – you an have a look at the cylinderXd eyamples. Best Mathias