porepy.params.rock module

Hard coded typical parameters that may be of use in simulations.

Contains standard values (e.g. found in Wikipedia) for permeability, elastic moduli etc.

Note that thermal expansion coefficients are linear (m/mK) for rocks, but volumetric (m^3/m^3) for fluids.

class Granite(theta_ref=None)[source]

Bases: UnitRock

Generic values for granite. Data partially from:

http://civilblog.org/2015/02/13/what-are-the-values-of-modulus-of-elasticity-poissons-ratio-for-different-rocks/

And: https://www.jsg.utexas.edu/tyzhu/files/Some-Useful-Numbers.pdf

Parameters: theta_ref (Optional[float]) –

specific_heat_capacity(theta=None)[source]

Determines specific heat capacity of granite.

Parameters: theta (float, optional) – temperature
Returns: specific heat capacity
Return type: float

thermal_conductivity(theta=None)[source]

Return themal conductivity of granite.

Parameters: theta (float, optional) – temperature in Celsius (not used)
Returns: thermal conductivity
Return type: float

class SandStone(theta_ref=None)[source]

Bases: UnitRock

Generic values for Sandstone.

Data partially from:: http://civilblog.org/2015/02/13/what-are-the-values-of-modulus-of-elasticity-poissons-ratio-for-different-rocks/

Parameters: theta_ref (Optional[float]) –

specific_heat_capacity(theta=None)[source]

Determines specific heat capacity of sandstone.

Parameters: theta (float, optional) – temperature
Returns: specific heat capacity
Return type: float

class Shale(theta_ref=None)[source]

Bases: UnitRock

Generic values for shale.

Data partially from:: http://civilblog.org/2015/02/13/what-are-the-values-of-modulus-of-elasticity-poissons-ratio-for-different-rocks/

Parameters: theta_ref (Optional[float]) –

specific_heat_capacity(theta=None)[source]

Determines specific heat capacity of shale.

Parameters: theta (float, optional) – temperature
Returns: specific heat capacity
Return type: float

class UnitRock(theta_ref=None)[source]

Bases: object

Mother of all rocks, all values are unity.

PERMEABILITY: Permeability

POROSITY: Porosity

LAMBDA: First Lamé parameter

MU: Shear modulus / Second Lamé parameter

YOUNG_MODULUS: Young’s modulus

POISSON_RATIO: Poisson’s ratio

specific_heat_capacity(theta=None)[source]

Determines specific heat capacity.

Parameters: theta (float, optional) – temperature
Returns: specific heat capacity
Return type: float

thermal_conductivity(_)[source]

Return themal conductivity.

May depend on temperature, but currently is fixed.

Returns: thermal conductivity
Return type: float

bulk_from_lame(lmbda, mu)[source]

Compute bulk modulus from Lamé parameters.

Parameters

lmbda (float) – First Lamé parameter
mu (float) – Shear modulus (second Lamé parameter)

Returns

bulk modulus

Return type

float

lame_from_young_poisson(e, nu)[source]

Compute Lamé parameters from Young’s modulus and Poisson’s ratio.

Parameters

e (float) – Young’s modulus
nu (float) – Poisson’s ratio

Returns

pair of first Lamé parameter and shear modulus

Return type

tuple(float, float)

poisson_from_lame(mu, lmbda)[source]

Compute Poisson’s ratio from Lamé parameters.

Parameters

mu (float) – shear modulus (second Lamé parameter)
lmbda (float) – first Lamé parameter

Returns

Poisson’s ratio

Return type

float

young_from_lame(lmbda, mu)[source]

Compute Young’s modulus from Lamé parameters.

Parameters

lmbda (float) – First Lamé parameter
mu (float) – Shear modulus (second Lamé parameter)

Returns

Young’s modulus

Return type

float