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 › Multicomponent flow › Reply To: Multicomponent flow April 13, 2021 at 8:36 am #5600 mathiasKeymaster Yes, you need to set them for both components.