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Improving a Two-Equation Turbulence Model for Canopy Flows Using Large-Eddy Simulation

Lopes, A.Silva ; Palma, J. M. L. M. ; Lopes, J. Viana

Boundary-layer meteorology, 2013-11, Vol.149 (2), p.231-257 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

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Título:
Improving a Two-Equation Turbulence Model for Canopy Flows Using Large-Eddy Simulation
Autor: Lopes, A.Silva ; Palma, J. M. L. M. ; Lopes, J. Viana
Assuntos: Atmospheric Protection/Air Quality Control/Air Pollution ; Atmospheric Sciences ; Canopies ; Computational fluid dynamics ; Convection, turbulence, diffusion. Boundary layer structure and dynamics ; Earth and Environmental Science ; Earth Sciences ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Forests ; Kinetic energy ; Large eddy simulation ; Marine ; Mathematical models ; Meteorology ; Navier-Stokes equations ; Simulation ; Turbulence ; Turbulence models
É parte de: Boundary-layer meteorology, 2013-11, Vol.149 (2), p.231-257
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Large-eddy simulations of the neutrally-stratified flow over an extended homogeneous forest were used to calibrate a canopy model for the Reynolds-averaged Navier–Stokes (RaNS) method with the k - ε turbulence model. It was found that, when modelling the forest as a porous medium, the canopy drag dissipates the turbulent kinetic energy (acts as a sink term). The proposed model was then tested in more complex flows: a finite length forest and a forested hill. In the finite length forest, the destruction of the turbulent kinetic energy by the canopy was overestimated near the edge, for a length approximately twice the tree height. In the forested hill, the model was less accurate inside the recirculation zone and overestimated the turbulent kinetic energy, due to an incorrect prediction of the production term. Nevertheless, the canopy model presented here provided consistent results in both a priori and a posteriori tests and improved the accuracy of RaNS simulations with the k - ε model.
Editor: Dordrecht: Springer Netherlands
Idioma: Inglês

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Improving a Two-Equation Turbulence Model for Canopy Flows Using Large-Eddy Simulation

Lopes, A.Silva ; Palma, J. M. L. M. ; Lopes, J. Viana

Dordrecht: Springer Netherlands

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