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 › Knudsen Number › Reply To: Knudsen Number September 13, 2021 at 11:44 am #5984 mathiasKeymaster √(γπ/2) is a constant in an incompressible isothermal set up!