OpenLB – Open Source Lattice Boltzmann Code › Forums › on Lattice Boltzmann Methods › General Topics › Permeability Calculation Poiseuille › Reply To: Permeability Calculation Poiseuille April 24, 2019 at 4:12 pm #4267 fkParticipant Which Dynamics do you use? If you use the GuoZhaoDynamics, that could be the problem. Or maybe your pin is too high, try something like 0.01.