The zeroGradient
function object creates a volume field with zero-gradient boundary conditions from another volume field.
The result can be used, for example, to post-process near-wall field values.
Operand | Type | Location |
---|---|---|
input | vol<Type>Field | $FOAM_CASE/<time>/<inpField> |
output file | - | - |
output field | vol<Type>Field | $FOAM_CASE/<time>/<outField> |
where <Type>=Scalar/Vector/SphericalTensor/SymmTensor/Tensor
.
Example of the zeroGradient
function object by using functions
sub-dictionary in system/controlDict
file:
zeroGradient1 { // Mandatory entries (unmodifiable) type zeroGradient; libs (fieldFunctionObjects); // Mandatory entries (runtime modifiable) fields (<field1> ... <fieldN>); \\(U "(T|k|epsilon|omega)"); // Optional entries (runtime modifiable) result @@<name>; // Optional (inherited) entries 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: zeroGradient | word | yes | - |
libs | Library name: fieldFunctionObjects | word | yes | - |
fields | Name of the operand fields | wordList | yes | - |
result | Name of the output field | word | no | zeroGradient(@) |
The inherited entries are elaborated in:
Usage by the postProcess
utility is not available.
A list of fields can contain exact names or regular expressions. The token '@@' in the result name is replaced by the name of the source field. In the special case of a single source field (specified as a non-regex), the '@@' token checking is suppressed.
The function object will skip over fields that would not benefit
processor
, empty
, zeroGradient
, symmetry
patches. This check should also prevent processing fields multiple times.Tutorial:
Source code:
History