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 › 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.