Back to Input Deck Cards

STRATA

Couples material ids and/or properties with a region in the problem domain.

Required Cards:

STRATA
Opens the strata block.
MATERIAL <string>

Name of the material property to be associated with a region.

Note: a filename can be provided instead of a material property name from which material IDs are read on a cell by cell basis
REGION <string>
Name of region to be associated with a material property. Not required if a material ID file is read.

Optional Cards:

START_TIME <float> <string>
Start time when STRATA card is relevant, where <string> indicates the units of time. This card is useful for changing a material property at a given point in time (e.g. due to human intrusion).
END_TIME <float> <string>
End time when STRATA card is relevant, where <string> indicates the units of time.
INACTIVE
Inactivates all cells in the associated REGION.
REALIZATION_DEPENDENT
Specifies that material IDs listed in the material ID file are realization dependent.

Examples

Assign Hanford unit material properties to the source zone region:

STRATA
  MATERIAL hanford_unit
  REGION source_zone
/

Assign material properties through material ids read from an HDF5 formatted file. No need for a region here as material ids are assigned to the entire grid on a cell by cell basis.

STRATA
  MATERIAL ../../field_material_ids.h5
/

Evolving strata:

MATERIAL_PROPERTY soil1
  ID 1
  ...
  PERMEABILITY
    PERM_ISO 1.d-12
  /
  ...
END

MATERIAL_PROPERTY soil2
  ID 2
  ...
  PERMEABILITY
    PERM_ISO 5.d-13
  /
  ...
END

STRATA
  REGION all
  MATERIAL soil1
  START_TIME 0.d0 y
  FINAL_TIME 25.d0 y
END

STRATA
  REGION all
  MATERIAL soil2
  START_TIME 25.d0 y
  FINAL_TIME 50.d0 y
END

Example HDF5 file with material ids

The HDF5 file must have two datasets named Cell Ids and Material Ids within a group named Materials. Use this python script and associated data file as an example of how to load material ids into an example input file. To use this script, you must install compatible versions of the h5py and numpy python libraries.

../../../_images/material_id_h5_file.png