The ddt
function object computes the Eulerian time derivative of an input volume field for time-variant simulations (not appropriate to steady-state simulations).
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 ddt
function object by using functions
sub-dictionary in system/controlDict
file:
ddt1 { // Mandatory entries (unmodifiable) type ddt; libs (fieldFunctionObjects); // Mandatory (inherited) entries (runtime modifiable) field <field>; // Optional (inherited) entries result <fieldResult>; 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: ddt | word | yes | - |
libs | Library name: fieldFunctionObjects | word | yes | - |
field | Name of the operand field | word | yes | - |
The inherited entries are elaborated in:
Example by using the postProcess
utility:
postProcess -func "ddt(<field>)"
Tutorial:
Source code:
History