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 › Poiseuille2D: Interpolated and local values(velocity and pressure) › Reply To: Poiseuille2D: Interpolated and local values(velocity and pressure) August 6, 2021 at 8:14 pm #5900 mathiasKeymaster You can use the unitConverter to get rho for pressure and initialize this rho. Best Mathias