Submicron Magnetic Structures Preconditioning Large Sparse Matrix Problems Biomolecular Interactions and Enzymatic Reactions Visitors Research Reports low and transport phenomena in porous media are of importance in a wide range of natural and industrial processes. The flow of water containing nutrients or pollutants in soils and aquifiers is of environmental concern. Of commercial relevance is the multiphase flow of oil and water in porous and fractured rock, as well as flow and dispersion in packed beds used for catalytic and separation processes.
Mechanical dispersion is caused by random spatial variations of the velocity field.
In order to model these processes, it is necessary to understand the pore scale mechanisms of flow and transport. When two miscible fluids are brought into contact, a transition zone develops across the interface, and the two fluids slowly diffuse into one another. However, if the two fluids are also flowing, there will be some additional mixing. Color coded flow structure in a simple cubic bead pack. High-velocity flow regions are colored yellow and white.