The flowType
function object computes the flow type indicator of an input velocity field.
The flow type indicator is obtained according to the following equation:
\[ \lambda = \frac{\mag{\tensor D} - \mag{\tensor \Omega}}{ \mag{\tensor D} + \mag{\tensor \Omega}} \]
where
\( \lambda \) | = | Flow type indicator |
\( \tensor D \) | = | Symmetric part of the gradient tensor of velocity |
\( \tensor \Omega \) | = | Skew-symmetric part of the gradient tensor of velocity |
The flow type indicator values mean:
-1 = rotational flow 0 = simple shear flow 1 = planar extensional flow
Operand | Type | Location |
---|---|---|
input | volVectorField | $FOAM_CASE/<time>/<inpField> |
output file | - | - |
output field | volScalarField | $FOAM_CASE/<time>/<outField> |
Example of the flowType
function object by using functions
sub-dictionary in system/controlDict
file:
flowType1 { // Mandatory entries (unmodifiable) type flowType; libs (fieldFunctionObjects); // Optional (inherited) entries field <field>; 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: flowType | word | yes | - |
libs | Library name: fieldFunctionObjects | word | yes | - |
The inherited entries are elaborated in:
Example by using the postProcess
utility:
postProcess -func flowType
Tutorial:
Source code:
History