Description🔗
The wallShearStress
function object computes the wall-shear stress at selected
wall patches.
where:
- \(\vec \tau\)
- Wall shear stress vector [m2/s2]
- \(\vec R\)
- Shear-stress symmetric tensor (retrieved from turbulence model)
- \(\vec n\)
- Patch normal vector (into the domain)
Operands🔗
Operand | Type | Location |
---|---|---|
input | - | - |
output file | dat | $FOAM_CASE/postProcessing/<FO>/<time>/<field> |
output field |
volVectorField (only boundaryField) |
$FOAM_CASE/<time>/<outField> |
Usage🔗
Example of the wallShearStress
function object by using functions
sub-dictionary in system/controlDict
file:
wallShearStress1
{
// Mandatory entries (unmodifiable)
type wallShearStress;
libs (fieldFunctionObjects);
// Optional entries (runtime modifiable)
patches (<patch1> ... <patchN>); // (wall1 "(wall2|wall3)");
// 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: wallShearStress | word | yes | - |
libs | Library name: fieldFunctionObjects | word | yes | - |
patches | Names of operand patches | wordList | no | all wall patches |
The inherited entries are elaborated in:
Example by using the postProcess
utility:
<solver> -postProcess -func wallShearStress
Further information🔗
Tutorial:
Source code:
API:
History:
- Introduced in version v1606+