OpenLB – Open Source Lattice Boltzmann Code › Forums › on Lattice Boltzmann Methods › General Topics › the geometry definition in cavity 2d problem › Reply To: the geometry definition in cavity 2d problem February 15, 2021 at 1:15 pm #5473 mathiasKeymaster Due to rounding errors (working with douple), we need to extant the domain in order to capture the lid entirely!