An unsteady-state (USS) test was performed on two carbonate samples that were used in experimental USS core flooding. Experimental and digital tests were performed with dead oil at ambient conditions. Oil recovery and relative permeability data were compared with experimental data, and a close match was achieved (left). Next, digital steady-state (SS) relative permeability tests performed on all major reservoir rock types used live oil fluid data at reservoir conditions, leading to a mixed-wet condition and initial water saturations that matched estimated reservoir water saturation. Relative permeability normalized using oil phase permeability at initial water saturation (middle). Digital modeling of oil and water pore transport enabled a view of dynamic phase saturation changes (right); SS tests were up to 50 times faster than with conventional physical lab analysis.