OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Venturi3d example › Re: Venturi3d example August 23, 2018 at 9:36 am #2907 LaurentDelaonParticipant Hi Mathias, I have a question base on cylinder2d : How can I change the color of cylinder (which is blue actually) ? put it in white by example… regards. Laurent.