New to LBM and OpenLB? Attend our upcoming one-week hands-on Spring School in Marseille/France from 19.05.2025 – 23.05.2025. OpenLB – Open Source Lattice Boltzmann Code › Forums › on 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.