dorsal/arxiv
View SchemaSubgrid-scale modeling of reacting scalar fluxes in large-eddy simulations of atmospheric boundary layers
| Authors | Jean-François Vinuesa, Fernando Porté-Agel, Sukanta Basu, Rob Stoll |
|---|---|
| Categories | |
| ArXiv ID | physics/0511203 |
| URL | https://arxiv.org/abs/physics/0511203 |
Abstract
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.
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"abstract": "In large-eddy simulations of atmospheric boundary layer turbulence, the\nlumped coefficient in the eddy-diffusion subgrid-scale (SGS) model is known to\ndepend on scale for the case of inert scalars. This scale dependence is\npredominant near the surface. In this paper, a scale-dependent dynamic SGS\nmodel for the turbulent transport of reacting scalars is implemented in\nlarge-eddy simulations of a neutral boundary layer. Since the model coefficient\nis computed dynamically from the dynamics of the resolved scales, the\nsimulations are free from any parameter tuning. A set of chemical cases\nrepresentative of various turbulent reacting flow regimes is examined. The\nreactants are involved in a first-order reaction and are injected in the\natmospheric boundary layer with a constant and uniform surface flux. Emphasis\nis placed on studying the combined effects of resolution and chemical regime on\nthe performance of the SGS model. Simulations with the scale-dependent dynamic\nmodel yield the expected trends of the coefficients as function of resolution,\nposition in the flow and chemical regime, leading to resolution-independent\nturbulent reactant fluxes.",
"arxiv_id": "physics/0511203",
"authors": [
"Jean-Fran\u00e7ois Vinuesa",
"Fernando Port\u00e9-Agel",
"Sukanta Basu",
"Rob Stoll"
],
"categories": [
"physics.ao-ph"
],
"title": "Subgrid-scale modeling of reacting scalar fluxes in large-eddy simulations of atmospheric boundary layers",
"url": "https://arxiv.org/abs/physics/0511203"
},
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