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SECONDARY_CONTINUUM

Specifies the secondary continuum properties.

The multiple continuum model is formally documented here. Multiple continuum must be set as an option under SIMULATION block to use:

SIMULATION
  SIMULATION_TYPE SUBSURFACE
  PROCESS_MODELS
    SUBSURFACE_TRANSPORT transport
      MODE GIRT
      OPTIONS
        MULTIPLE_CONTINUUM
      /
    /
  /
END

Required Cards

TYPE <string>

Secondary continuum geometry, must be specified first. Options include: SLAB, NESTED_CUBES, or NESTED_SPHERES.

NUM_CELLS <int>

Number of cells in secondary continuum per primary cell.

POROSITY <float>

Porosity of the matrix.

LIQUID_DIFFUSION_COEFFICIENT <float>

Effective aqueous diffusion coefficient in the matrix, includes tortuosity.

Optional Cards:

APERTURE <float>

Half fracture aperture [m]. Can only be specified for SLAB and NESTED_CUBES geometry.

EPSILON <float>

Fracture volume fraction calculated as, \(\varepsilon = \frac{b}{b+L}\), where \(b\) is the half fracture aperture and \(L\) is the matrix length. Epsilon can be set to 1.0 to neglect secondary continuum calculation for a specific material.

EPSILON DATASET <string>

Epsilon of secondary continuum specified through dataset.

FRACTURE_SPACING <float>

The size of the matrix block plus the fracture aperture [m]. Can only be specified for NESTED_CUBES geometry.

GAS_DIFFUSION_COEFFICIENT <float>

Effective gas diffusion coefficient in the matrix, includes tortuosity. Gas transport must be turned on in reactive transport mode.

LENGTH <float>

Half fracture spacing [m]. Can only be specified for SLAB geometry.

LENGTH DATASET <string>

Half fracture spacing specified through dataset.

LOG_GRID_SPACING <float>

Enables log spacing and specifies size of outer spacing [m] with outer cell being the secondary cell closest to the primary. Can only be specified for SLAB and NESTED_CUBES geometry

MATRIX_BLOCK_SIZE <float>

Length of largest matrix block size [m]. Can only be specified for NESTED_CUBES geometry.

RADIUS <float>

Length of radius for NESTED_SPHERES geometry [m].

TEMPERATURE <float>

Temperature of the matrix.

Example

MATERIAL_PROPERTY
   ...
   SECONDARY_CONTINUUM
     TYPE SLAB
     LENGTH 1
     NUM_CELLS 5
     EPSILON 0.00005
     LIQUID_DIFFUSION_COEFFICIENT 1.6d-10
     POROSITY 0.01
   /
 END