Digital rock physics and macroscale models for two-fluid flow in porous media

James E McClure, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States, Ryan T Armstrong, University of New South Wales, Sydney, Australia, Steffen Schlüter, Helmholtz Centre for Environmental Research - UFZ, Soil Physics, Leipzig, Germany, Steffen Berg, Shell Global Solutions International, Rijswijk, Netherlands, William G Gray, University of North Carolina at Chapel Hill, Environmental Sciences and Engineering, Chapel Hill, NC, United States and Cass T Miller, University of North Carolina at Chapel Hill, Environmental Science and Engineering, Chapel Hill, NC, United States