OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Problem in example code porousPoiseuille2d › Reply To: Problem in example code porousPoiseuille2d September 24, 2019 at 9:12 am #4570 mathiasKeymaster The max. velocity seems all right. Can you check the distance to the wall? Maybe, the channel width is not correct, i.e. does not fit the one assumed for the analytical solution. Best Mathias