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SATURATION_FUNCTION

Specifies the permeability function, saturation function, and parameters to be associated with a material property. This card is only for TH or MPHASE/FLASH2 modes. In GENERAL and RICHARDS modes, use the CHARACTERISTIC_CURVES card.

Required Cards:

SATURATION_FUNCTION <string>
Opens the SATURATION_FUNCTION block, where <string> indicates the name by which this saturation function may be identified and/or linked.
SATURATION_FUNCTION_TYPE <string>

Indicates which saturation function is used. The options include: VAN_GENUCTHEN, BROOKS_COREY, or THOMEER_COREY.

Required cards specific to each SATURATION_FUNCTION_TYPE:
  • VAN_GENUCHTEN:
    • ALPHA <float>

      The van Genuchten alpha parameter [Pa-1].

    • LAMBDA <float>

      The van Genuchten m parameter, as in (m = 1-1/n) [-].

    • [Documented in Theory Guide under van Genuchten Saturation Function]

  • BROOKS_COREY:
    • ALPHA <float>

      The Brooks-Corey alpha parameter [Pa-1].

    • LAMBDA <float>

      The Brooks-Corey lambda parameter [-].

    • [Documented in Theory Guide under Brooks-Corey Saturation Function]

  • THOMEER_COREY
    • ALPHA <float>

      The Thomeer-Corey alpha parameter [Pa-1].

    • LAMBDA <float>

      The Thomer-Corey m parameter [-].

PERMEABILITY_FUNCTION_TYPE <string>
Indicates which permeability function is used. Options include: BURDINE, or MUALEM. The Relative Permeability Functions section in the Theory Guide documents these options based on van Genuchten and Brooks-Corey saturation functions.
RESIDUAL_SATURATION <float>
Indicates the fluid residual saturation [-].

Optional Cards:

BETAC <float>
Placeholder. Currently not used.
MAX_CAPILLARY_PRESSURE <float>
Cut off for maximum capillary pressure [Pa]. Currently supported in the C02 modes only.
POWER <float>
Placeholder. Currently not used.

Examples

SATURATION_FUNCTION sf1
  SATURATION_FUNCTION_TYPE VAN_GENUCHTEN
  PERMEABILITY_FUNCTION_TYPE BURDINE
  RESIDUAL_SATURATION 0.16d0
  LAMBDA 0.3391d0
  ALPHA 7.2727d-4
/

SATURATION_FUNCTION sf2
  SATURATION_FUNCTION_TYPE BROOKS_COREY
  PERMEABILITY_FUNCTION_TYPE BURDINE
  RESIDUAL_SATURATION 0.1299d0
  LAMBDA 0.7479d0
  ALPHA 1.10d-5
/

SATURATION_FUNCTION sf3
  SATURATION_FUNCTION_TYPE VAN_GENUCHTEN
  PERMEABILITY_FUNCTION_TYPE MUALEM
  RESIDUAL_SATURATION 0.16d0
  LAMBDA 0.3391d0
  ALPHA 7.2727d-4
/