The Boundary Conditions tab is divided into four panels: Computational Directions, Boundary Conditions in Longitudinal Direction, Experiment Input / Output, Boundary Conditions in Transverse Direction, and Pore-Solid Boundary Conditions. The parameters are very similar to the parameters in the FlowDict module, so please refer to the description in the FlowDict handbook for details. Note, that in FlowDict more options are available, that cannot be selected in the Relative Permeability options dialog.