OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Cylinder2D study › Reply To: Cylinder2D study February 8, 2023 at 11:36 am #7181 FBukreevKeymaster Hello, if you execute getResults each time step, then it must be written out also each time step. If you have too strong turbulence then the flow may come sometimes back from the outlet. Greetings, Fedor