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OBSERVATION

Sets up an observation point within the problem domain.

Note: Be sure to add the OBSERVATION_FILE card to the OUTPUT section as this toggles on the printing of observation points to files with the suffix ‘*-obs-#.dat’ where # is the MPI process rank.

Required Cards:

OBSERVATION

Opens the OBSERVATION block.

REGION <string>

Specifies the name of the region (i.e. point in space) within the problem domain at which the observation is placed. Only one region may be defined per block.

Note: One should use the singular COORDINATE keyword to define a point in space when defining the region, not a 2D surface or 3D volume, as observation points will be placed within all grid cells within the surface or volume.

Optional Cards:

VELOCITY

Specifies that cell centered velocities be printed for the cells being observed.

AT_CELL_CENTER

Observation data sampled at center of cell intersected by observation (default).

AT_COORDINATE

Observation data interpolated (linearly) from neighboring cell centers to coordinate. CAUTION: Interpolation of concentrations when nonlinear geochemistry is modeled can result in erroneous results.

AGGREGATE_METRIC

Opens the AGGREGATE_METRIC block, which produces a separate aggregate metric ( -agg) output file that:

-searches the REGION associated with a given OBSERVATION, and computes the aggregate metric (e.g. max value of temperature)

-reports the location at which that max value occurs as well as all other OUTPUT variables of interest, at all observation times

Currently supported AGGREGATE_METRICs:

• MAX <string> , where <string> corresponds to the output variable of interest

Examples

OBSERVATION
  REGION well-2-9
  VELOCITY
/

OBSERVATION
  REGION observation_point2
  AT_COORDINATE
/

REGION observation_point3
  COORDINATE 6335.2 3992.5 107.3
/

OBSERVATION
  REGION observation_region
  AGGREGATE_METRIC
    MAX TOTAL Tracer
    MAX LIQUID_SATURATION
    MAX TEMPERATURE
  /
/