The volFieldValue function object provides options to manipulate volume field data into derived forms, e.g. to report summations, averages and extrema.


  • none : no operation
  • sum : summation
  • sumMag : sum of magnitude
  • average: average
  • weightedAverage: weighted average
  • volAverage: volume average
  • weightedVolAverage: weighted volume average
  • volIntegrate: volume integral
  • min: minimum
  • max: maximum
  • CoV: coefficient of variation


Example of the volFieldValue function object by using functions sub-dictionary in system/controlDict file:

    // Mandatory entries (unmodifiable)
    type            volFieldValue;
    libs            (fieldFunctionObjects);

    // Mandatory entries (runtime modifiable)
    fields          (<field1> <field2> ... <fieldN>);
    operation       <operationType>;
    regionType      <volRegion>;

    // Optional entries (runtime modifiable)
    postOperation   none;
    weightField     alpha1;

    // Optional (inherited) entries
    writeFields     false;
    scalingFactor   1.0;
    writePrecision  8;
    writeToFile     true;
    useUserTime     true;
    region          region0;
    enabled         true;
    log             true;
    timeStart       0;
    timeEnd         1000;
    executeControl  timeStep;
    executeInterval 1;
    writeControl    timeStep;
    writeInterval   1;

where the entries mean:

Property Description Type Required Default
type Type name: surfaceFieldValue word yes -
libs Library name: fieldFunctionObjects word yes -
fields Names of operand fields wordList yes -
regionType Face regionType: see below word yes -
name Name for regionType word yes -
operation Operation type: see below word yes -
postOperation Post-operation type: see below word no none
weightField Name of field to apply weighting word no none

The inherited entries are elaborated in:

Options for the regionType entry:

cellZone     | requires a 'name' entry to specify the cellZone
all          | all cells

Options for the operation entry:

none                 | No operation
min                  | Minimum
max                  | Maximum
sum                  | Sum
sumMag               | Sum of component magnitudes
average              | Ensemble average
volAverage           | Volume weighted average
volIntegrate         | Volume integral
CoV                  | Coefficient of variation: standard deviation/mean
weightedSum          | Weighted sum
weightedAverage      | Weighted average
weightedVolAverage   | Weighted volume average
weightedVolIntegrate | Weighted volume integral

Options for the postOperation entry:

none          | No additional operation after calculation
mag           | Component-wise `mag()` after normal operation
sqrt          | Component-wise `sqrt()` after normal operation

Usage by the postProcess utility is not available.

Stored properties

Reduced data

The following data are stored by the function object, and can be used by other function objects:

  • <operation-type>(<region-name>, <field-name>) : result

Further information


Source code:




  • Introduced in version 1.7.0
  • Previously known as: