SatuDict is the GeoDict module for the computation of saturation-dependent material parameters in porous media. In many applications, the porous media is partly saturated, so that part of the pore space is filled with water and part with air, gas, or oil. Oil-water, water-air, or other two-phase systems are possible. Generally, one of the fluids preferably wets the media surfaces and is therefore called the wetting phase, whereas the other fluid, with less affinity for the media, is called the non-wetting phase. It is not unusual that water is the non-wetting phase fluid. For example, in a gas-diffusion layer (GDL) with hydrophobic fibers water is the non-wetting phase while air is the wetting phase. In contrast are digital rocks where water is the wetting phase and oil is the non-wetting phase.

Saturation alters the values of material properties of the porous media, such as flow permeability, diffusivity, and thermal or electrical conductivity. These material properties (constant for one-phase systems) come to depend on its saturation. In the SatuDict GUI, these saturation-dependent properties are named as relative: Relative Permeability, Relative Gas Diffusivity, and Relative Thermal Conductivity and Relative Electrical Conductivity (Resistivity Index).

This process can be calculated and then visualized in various ways in the GeoDict Result Viewer from the result files saved in the project folder during the simulation.