atmPlantCanopyUSource
applies sources on velocity, i.e. U
, to incorporate effects of plant canopy for atmospheric boundary layer modelling.atmPlantCanopyUSource
can be applied on any RAS turbulence model.atmPlantCanopyUSource
inherits the traits of the fvOption, and cellSetOption
.Corrections applied to:
U | Velocity [m/s]
Required fields:
U | Velocity [m/s] plantCd | Plant canopy drag coefficient [-] leafAreaDensity | Leaf area density [1/m]
The model expression ([69], Eq. 42):
\[ S_p -= \alpha \rho \left( C_d {LAD} |\u_o| \right) \u \]
where
\( f_M \) | = | fvMatrix of the velocity field |
\( C_d \) | = | Plant canopy drag coefficient [-] |
\( {LAD} \) | = | Leaf area density [1/m] |
\( \u_o \) | = | Previous-iteration velocity field [m/s] |
\( \alpha \) | = | Phase fraction in multiphase computations, otherwise equals to 1 |
\( \rho \) | = | Fluid density in compressible computations, otherwise equals to 1 |
Example of the fvOptions specification using constant/fvOptions
file:
atmPlantCanopyUSource1 { // Mandatory entries (unmodifiable) type atmPlantCanopyUSource; atmPlantCanopyUSourceCoeffs { // Mandatory (inherited) entries (unmodifiable) selectionMode all; // Optional entries (unmodifiable) rho rho; } // Optional (inherited) entries ... }
where the entries mean:
Property | Description | Type | Required | Default |
---|---|---|---|---|
type | Type name: atmPlantCanopyUSource | word | yes | - |
rho | Name of density field | word | no | rho |
The inherited entries are elaborated in:
cellSetOption
Tutorials
Source code
History