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 › setWallFunctionBoundary › Reply To: setWallFunctionBoundary April 10, 2023 at 2:42 pm #7386 mathiasKeymaster Dear Xu, I have no capacites to look into that. You need to research it yourself. Best Mathias