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 › code blockGeometryStructure2D.hh. › Re: code blockGeometryStructure2D.hh. August 27, 2018 at 11:18 am #2912 LaurentDelaonParticipant I think its an efficiency issue… Maybe I made mistake ?