Define the materials in the structure and their properties in the Constituent Materials tab.

The Temperature at which the mass transport process occurs is selectable in Kelvin [K], Celsius [°C], and Fahrenheit [°F], and has a default value of 293.15 K, 20.0 °C, or 68 °F, respectively.

The fluid flowing through all pore and porous materials can be set by clicking Set all Fluids to and selecting it from the pull-down menu.

If one of the predefined fluids is used, the values for Density, Dynamic Viscosity, and Kinematic Viscosity are taken from the GeoDict Material Database and are dependent on the given Temperature value. If Manual is chosen, these values can be entered manually.

Any values entered manually, e.g., those for a special type of oil, can also be added to the Material Database. More information on editing, expanding, and using the GeoDict Material Database is available.

As soon as the user sets the fluid in the pull-down menu, this choice appears under the Material subtab. Now this fluid is shown to occupy the previously unassigned pore space with the ID 00 and in the porous material with the ID02. The density and the dynamic viscosity of this fluid, at the selected temperature range, is shown under the Fluid Density/Viscosity subtab.

All materials assigned to the material IDs, which fall into one of the material categories (pore, porous or solid), can be selected individually through the Material Selector dialog, by clicking on the material’s buttons. Fluid flow can happen in pores and in porous materials, but not in solid materials.

For porous materials, also the information about the permeability needs to be defined on the Permeability subtab. If the Pass Through Model Reflection Probability will be chosen later on for a porous material and the reflection probability is not selected manually, also the porosity of a porous material needs to be defined on the Porosity subtab.