New to LBM and OpenLB? Attend our upcoming one-week hands-on Spring School in Marseille/France from 19.05.2025 – 23.05.2025. OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › material for inner area of the cylinder › Reply To: material for inner area of the cylinder October 23, 2024 at 1:47 pm #9413 mathiasKeymaster Its the outerClean method which removes the not needed cells.