OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Poiseuille 2D (Erroneous results for lx and ly smaller than 1) › Reply To: Poiseuille 2D (Erroneous results for lx and ly smaller than 1) August 2, 2021 at 9:31 pm #5882 AdrianKeymaster Reducing only the channel size without also changing the physical discretization resp. N accordingly results in a very small lattice. This simulation converges after only a small number of steps – before any VTK output were written.