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 Lattice Boltzmann Methods › General Topics › Permeability Calculation Poiseuille › Reply To: Permeability Calculation Poiseuille April 24, 2019 at 2:49 pm #4265 fkParticipant The code looks mostly fine, but try to smooth pin: AnalyticalConst2D<T,T> rho(converter.getLatticeDensityFromPhysPressure(frac[0]*pin));