OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Point-wise physical Force › Reply To: Point-wise physical Force December 8, 2021 at 2:08 pm #6213 AdrianKeymaster You can check the laminar/cylinder(2,3)d examples for a valid usage of the drag functor. As the drag and lift calculation relates to a specific obstacle in the flow you can not apply it to inlet / outlet.