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 › An issue when running parallel simulations › Reply To: An issue when running parallel simulations March 18, 2024 at 6:31 pm #8411 avrachan1Participant Sorry my mistake, SuperLatticeField3D <T,DESCRIPTOR,POPULATION> populationPF(A); followed by B.definePopulations(bulkIndicator,populationPF); leads to the error.