Add a Porous Material node (
) under a
Materials node in a model component to add a definition of a porous material. In the settings for this node you can define the porosity of the porous material, or you can right-click the
Porous Material node to add
Fluid,
Solid,
Pellet, and
Immobile Fluid subnodes as required and define the porous material properties in those subnodes.
If you have not added any subnode for defining the porous material, enter a value or expression between 0 and 1 in the εp field. Otherwise, depending on the added subnodes, the corresponding expression for the porosity of the porous material appears here under
Volume fractions of immobile phases.
Physics features that support porous media request properties per phase present. These properties are listed in the Phase-Specific Properties table. All phase-specific properties need to be specified in a corresponding subnode to the
Porous Material node (as a
Solid,
Liquid, or
Pellet subnode). The list can contain multiple entries of the same kind, such as the density of the fluid and the density of the solid. When a subnode is missing, a red stop symbol appears in the table, and the
Add Required Phase Nodes button (
) is active. Click that button to create the missing subnodes. You then need to go to the created subnodes and define all requested properties there.
Right-click a row in the Property and Phase columns to choose Go to Requesting Node to move to the physics node that requested the property, or choose
Go to Source to move to the subnode that is the source for the property, when applicable.
From the Material list, choose the material to represent the homogenized material:
Locally defined (the default), or select any other material that you have added. Click the
Go to Material button (
) to move to the selected material’s node. Click the
Add Material from Library button (
to add a material from the
Add Material to Pellet window. You can also click the downward arrow next to the button and choose
Blank Material to add a new blank material. In both cases, the added material becomes selected in the
Material list.
When physics features that do not support porous media take properties From material, and the domain material is a porous material, then properties are shown in the
Homogenized Properties table. Here, there is only one set of properties and not one per phase. The properties are to be thought of as homogenized in some manner. The material is porous, but for the one-phase interface, homogenized properties are used. In this manner you can, for example, add a Solid Mechanics interface to a model of porous media and model the structural mechanics part as usual. When the
Material in the
Homogenized Material section is
Locally defined, enter values or expressions for the properties in the
Value column.