Subgrid-scale modeling of reacting scalar fluxes in large-eddy simulations of atmospheric boundary layers

In large-eddy simulations of atmospheric boundary layer turbulence, the lumped coefficient in the eddy-diffusion subgrid-scale (SGS) model is known to depend on scale for the case of inert scalars. This scale dependence is predominant near the surface. In this paper, a scale-dependent dynamic SGS mo...

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Bibliographic Details
Published in:Environmental fluid mechanics (Dordrecht, Netherlands : 2001) Netherlands : 2001), 2006-04, Vol.6 (2), p.115-131
Main Authors: VINUESA, J.-F, PORTE-AGEL, F, BASU, S, STOLL, R
Format: Article
Language:English
Subjects:
Atmosphere
Atmospheric boundary layer
Atmospheric turbulence
Boundary layers
Convection, turbulence, diffusion. Boundary layer structure and dynamics
Earth, ocean, space
Exact sciences and technology
External geophysics
Meteorology
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Summary:In large-eddy simulations of atmospheric boundary layer turbulence, the lumped coefficient in the eddy-diffusion subgrid-scale (SGS) model is known to depend on scale for the case of inert scalars. This scale dependence is predominant near the surface. In this paper, a scale-dependent dynamic SGS model for the turbulent transport of reacting scalars is implemented in large-eddy simulations of a neutral boundary layer. Since the model coefficient is computed dynamically from the dynamics of the resolved scales, the simulations are free from any parameter tuning. A set of chemical cases representative of various turbulent reacting flow regimes is examined. The reactants are involved in a first-order reaction and are injected in the atmospheric boundary layer with a constant and uniform surface flux. Emphasis is placed on studying the combined effects of resolution and chemical regime on the performance of the SGS model. Simulations with the scale-dependent dynamic model yield the expected trends of the coefficients as function of resolution, position in the flow and chemical regime, leading to resolution-independent turbulent reactant fluxes.[PUBLICATION ABSTRACT]
ISSN:1567-7419
1573-1510
DOI:10.1007/s10652-005-6020-9