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 › Poiseuille 2D physical kinematic viscosity (no output) › Reply To: Poiseuille 2D physical kinematic viscosity (no output) August 5, 2021 at 2:42 am #5889 achodankarParticipant This problem is fixed. I had to change the lattice relaxation time. All is good now