Pressure dependent porosity
Overview
This model assumes a simple exponential law for the porosity as function of pressure, i.e.
\[\phi = \phi_{ref} \, exp ( c \cdot ( p - p_{ref} ) )\]
where \(\phi_{ref}\) is the reference porosity at reference pressure, \(p_{ref}\) , \(p\) is the pressure and, \(c\) is the compressibility.
Parameters
The following attributes are supported:
Name |
Type |
Default |
Description |
---|---|---|---|
compressibility |
real64 |
required |
Solid compressibility |
defaultReferencePorosity |
real64 |
required |
Default value of the reference porosity |
name |
string |
required |
A name is required for any non-unique nodes |
referencePressure |
real64 |
required |
Reference pressure for solid compressibility |
Example
<Constitutive>
...
<PressurePorosity name="rockPorosity"
referencePressure="1.0e27"
defaultReferencePorosity="0.3"
compressibility="1.0e-9"/>
...
</Constitutive>