OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › importing stl geometry files (cylinder3d) › Re: importing stl geometry files (cylinder3d) October 4, 2018 at 1:45 pm #2948 mathiasKeymaster Yes, the material modification needs to be adapted as well as the setting of boundary conditions. But that needs to be done carefully. I would do it step by step looking at the geometry output file with paraview.