Storage Model
The Storage Model node adds Equation 4-4 (excluding any mass sources). Use it to define the fluid and porous media properties, including a storage term for the specific storage.
Shell Properties
The settings are the same as for the Shell Properties section of the Richards’ Equation Model node.
Fluid Properties
The settings are the same as for the Fluid and Matrix Properties node except a gas constant type is not required.
Matrix Properties
The settings are the same as in the Matrix Properties section under Fluid and Matrix Properties.
Storage Model
Select a Storage S (SI unit: 1/Pa) — Linearized storage (the default) or User defined.
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For User defined enter a value or expression for Storage S (SI unit: 1/Pa).
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For Linearized storage it uses the following linear equation to define the storage:
This is equivalent to the Reuss average of the fluid and solid compressibilities. Enter the value or expression for each of the following:
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Compressibility of fluid χf (SI unit: 1/Pa). The default uses values From material. For User defined, the default is 4·10−10 1/Pa.
 Effective compressibility of matrix χp (SI unit: 1/Pa). The default is 1·10−4 1/Pa).