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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.

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.

Examples

OBSERVATION
  REGION well-2-9
  VELOCITY
/

OBSERVATION
  REGION observation_point2
  AT_COORDINATE
/

REGION observation_point3
  COORDINATE 6335.2 3992.5 107.3
/