A Note on Two-Equation Closure Modelling of Canopy Flow |
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| Authors: | Andrey Sogachev |
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| Institution: | 1.Wind Energy Division,Ris? National Laboratory for Sustainable Energy, Technical University of Denmark,Roskilde,Denmark |
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| Abstract: | The note presents a rational approach to modelling the source/sink due to vegetation or buoyancy effects that appear in the
turbulent kinetic energy, E, equation and a supplementary equation for a length-scale determining variable, φ, when two-equation closure is applied to canopy and atmospheric boundary-layer flows. The approach implements only standard
model coefficients C
φ1 and C
φ2 in the production and destruction terms of the φ equation, respectively. Numerical tests illustrate the practical applicability of the method, where, for example, simulations
with the E–ω model (where  is the specific dissipation and  is the dissipation rate of E) properly reproduce both the surface-layer wind profile estimated from the Monin-Obukhov similarity theory and the mixing-height
evolution observed above forested terrain in Southern Finland. |
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| Keywords: | Atmospheric boundary layer Canopy flow Non-neutral stratification Two-equation models Turbulence closure |
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