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CFDWind2.0

Submitted by Roberto A. Chav... on May 27, 2015 - 12:00am
Main hypothesis

Similar to CFDWind1, this model assumes isotropic eddy-viscosity turbulence,and the two-equation closure scheme (k-ε) modified for atmospheric flows. However, in order to extend the surface layer limitations to the full Atmospheric Boundary Layer (ABL) depth, it is necessary to include Coriolis effects and to limit the growth of turbulence with height, as demonstrated by Detering & Etling (1985).

This is achieved in the k-ε by adopting the Apsley & Castro (1994) correction on the Cε1 constant for neutral conditions.

A simulation of horizontally homogeneous conditions (i.e. a 1D ) is firstly carried out as a precursor simulation in order to define the inlet conditions for the real-terrain run.

Software
Solver
OpenFOAM-2.1.1 & OpenFOAM-2.4.0
License
Regime
Turbulence
Turbulence closure
Turbulence model

k-ε  modified through the Apsley and Castro (1997) approach.

Atmospheric boundary layer
Range
Coriolis
Yes
Atmospheric Stability
Atmospheric Stability
No
Canopy
Forest canopy
Yes
Canopy model
Source/sink terms in the momentum and turbulence-closure equations as developed by Sogachev & Panferov (2006) and Sogachev (2009).
Wind farm
Wind turbine
No
Remarks
  • Apsley D.and Castro I. 1997. A Limited-Length-Scale k-ε Model for the Neutral and Stably-Stratified
    Atmospheric Boundary Layer, Bound.-Lay. Meteorol. 83: 75-78
  • Detering H and Etling D. 1985 Application of the E-ε Turbulence Model to the Atmospheric Boundary Layer. Bound.-Lay. Meteorol. 83:75-78
  • Sogachev, A & Panferov , O. 2006. Modification of two-equation models to account
    for plant drag. Bound.-Lay. Meteorol. 121:229–266
  • Sogachev, A., 2009. A Note on Two-Equation Closure Modelling of Canopy Flow. Bound.-Lay. Meteorol, 130(3), 423–435