Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Cylinder2D study › Reply To: Cylinder2D study February 2, 2023 at 10:35 am #7165 FBukreevKeymaster You mast use the AnalyticalConst2D instead of a normal variable