Poroelasticity#

You can use the Poroelasticity component to solve the poroelasticity equation with or without inertia. Whether inertia or body forces are included is determined by the Poroelasticity property settings. Gravitational body forces are included if the gravity_field is set in the Problem. Table 21 lists the poroelastic bulk rheology implemented for the poroelaticity equation.

Table 21 Elasticity bulk rheologies.#
Bulk Rheology	Description
`IsotropicLinearPoroelasticity`	Isotropic, linear poroelasticity

Table 22 Properties defining elasticity bulk rheologies.#
Subfield	L	Components
`solid_density`	X
`fluid_density`	X
`fluid_viscosity`	X
`porosity`	X
`body_force`	O	x, y, z
`gravitational_acceleration`	O	x, y, z
`shear_modulus`	X
`drained_bulk_modulus`	X
`biot_coefficient`	X
`fluid_bulk_modulus`	X
`solid_bulk_modulus`	X
`isotropic_permeability`	X
`tensor_permeability`	O	xx, yy, zz, xy, yz, xz
`biot_modulus`	I
`reference_stress`	O	xx, yy, zz, xy, yz, xz
`reference_strain`	O	xx, yy, zz, xy, yz, xz

X: required value in auxiliary field spatial database
O: optional value in auxiliary field spatial database
I: internal auxiliary subfield; computed from spatial database values L: isotropic, linear poroelasticity

Table 23 Derived subfields that are available for output for poroelasticity bulk rheologies.#
Subfield	L	Components
`cauchy_stress`	X	xx, yy, zz, xy, yz, xz
`cauchy_strain`	X	xx, yy, zz, xy, yz, xz
`bulk_density`	X
`water_content`	X

When porosity is enabled as a state variable, it will be included in the output along with the derived subfields.