Transport processes in porous materials are determined by interaction mechanisms at the interface between liquid and solid. Applications can be found in the field of industrial and biological processes such as geohydrology, fuel cells, membranes, catalysts, reactors and building materials. A complicating factor here is the fact that the pore fluid can often consist of several phases (liquid, gas), whereby mass, momentum and energy can also be exchanged between these phases. Since it is impossible to give an unambiguous description of the non-stationary contact surfaces between fluids, gases and solid at the pore scale, upscaling procedures must be defined in order to mathematically describe transport phenomena in porous materials. Unique experimental facilities and theoretical knowledge from Utrecht and Eindhoven are brought together within this sub-theme. There are also several research projects within this theme with substantial sponsorship from Shell, Unilever, Océ, and NOW. The DARCY CENTER will establish a clear link with the INTERPORE platform. The recent INTERPORE symposium in Vlaardingen (Unilever, 28 October 2014) provides an illustration of successful cross-curricular collaboration and substantive profiling.