OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Poiseuille 2D Center Velocity Error (Forced,bounceBack) › Reply To: Poiseuille 2D Center Velocity Error (Forced,bounceBack) July 7, 2021 at 8:01 pm #5811 mathiasKeymaster LBM is a second order scheme, i.e. the numerical solution will approach the analytical one up to an numerical error. Best Mathias