Overview🔗
The applyBoundaryLayer
utility sets the velocity and turbulence-field profiles
near to wall patches based on the one-seventh power law.
Usage🔗
Synopsis🔗
applyBoundaryLayer [OPTIONS]
Examples
Specify the boundary-layer thickness of 0.1 [m] and write optional turbulence fields:
applyBoundaryLayer -ybl 0.1 -writeTurbulenceFields
Input🔗
Arguments
No argument needed.
Options
-Cbl <scalar> Boundary-layer thickness as Cbl * mean distance to wall
-case <dir> Case directory (instead of current directory)
-decomposeParDict <file>
Alternative decomposePar dictionary file
-parallel Run in parallel
-region <name> Specify alternative mesh region
-writeTurbulenceFields
Write the turbulence fields
-ybl <scalar> Specify the boundary-layer thickness
-doc Display documentation in browser
-help Display short help and exit
-help-compat Display compatibility options and exit
-help-full Display full help and exit
Files
No file needed.
Fields
No field needed.
Output🔗
Logs
No log output.
Files
No file output.
Fields
By default, the path to write the fields is <case>/<time>/
and the utility
will overwrite the local velocity field. In addition, the
-writeTurbulenceFields
option can be used to evaluate turbulence fields
using the new velocity profile for:
Property | Description | Type |
---|---|---|
nut |
Turbulence viscosity | volScalarField |
epsilon |
Turbulence kinetic energy dissipation rate | volScalarField |
k |
Turbulence kinetic energy | volScalarField |
omega |
Specific dissipation rate | volScalarField |
nuTilda |
Modified turbulence viscosit | volScalarField |
Method🔗
\[\frac{u}{U} = \left(\frac{y}{\delta}\right)^{\frac{1}{7}}\]Where
- \(u\)
- boundary layer velocity, [m/s]
- \(U\)
- freestream velocity, [m/s]
- \(y\)
- normal wall distance, [m]
- \(\delta\)
- boundary layer thickness, [m]
The boundary layer thickness is user defined as either:
- a fixed height
- proportional to the average wall distance for the entire mesh
For example, the boundary layer profile using a freestream velocity of 1 m/s and boundary layer height of 0.05 m is shown below.
Further information🔗
Tutorial:
Source code:
History:
- Introduced in version 1.5