OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Venturi3d example › Re: Venturi3d example June 18, 2018 at 6:48 pm #2848 LaurentDelaonParticipant Hi Robin, ok the porous will reduce your transitory state wich is maybe not good, and so the global stationnary state is less affected. seem work like a relaxation constraint… thank’s