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 › How to create 2D triangle ? › Reply To: How to create 2D triangle ? November 23, 2021 at 2:06 pm #6191 mathiasKeymaster For not lattice parallel outlets you cannot chose PressureBC. You need to set VelocityBC.