The continuityError
function object computes local, global and cumulative continuity errors for a flux field.
Local continuity error, \(\epsilon_\text{local}\):
\[ \epsilon_\text{local} = \Delta_t \langle |x| \rangle \]
Global continuity error, \(\epsilon_\text{global}\):
\[ \epsilon_\text{global} = \Delta_t \langle |x| \rangle \]
Cumulative continuity, \(\epsilon_\text{cum}\):
\[ \epsilon_\text{cum} += \epsilon_\text{global} \]
where
\( \Delta_t \) | = | Time-step size |
\( <.> \) | = | Cell-volume weighted average operator |
\( x \) | = | \( \nabla \cdot \phi \) |
\( \phi \) | = | Flux field |
Operand | Type | Location |
---|---|---|
input | - | - |
output file | dat | $FOAM_CASE/postProcessing/<FO>/<time>/<file> |
output field | - | - |
Example of the continuityError
function object by using functions
sub-dictionary in system/controlDict
file:
continuityError1 { // Mandatory entries (unmodifiable) type continuityError; libs (fieldFunctionObjects); // Optional entries (runtime modifiable) phi phi; // Optional (inherited) entries 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: continuityError | word | yes | - |
libs | Library name: fieldFunctionObjects | word | yes | - |
phi | Name of flux field | word | no | phi |
The inherited entries are elaborated in:
Example by using the postProcess -func
utility:
postProcess -func "continuityError(<field1>, <field2>, ..., <fieldN>)"
Tutorial:
Source code:
History