dorsal/arxiv
View SchemaStatistics of temperature fluctuations in a buoyancy dominated boundary layer flow simulated by a Large-eddy simulation model
| Authors | M. Antonelli, A. Mazzino, U. Rizza |
|---|---|
| Categories | |
| ArXiv ID | physics/0202047 |
| URL | https://arxiv.org/abs/physics/0202047 |
| DOI | 10.1175/1520-0469(2003)060<0215:SOTFIA>2.0.CO;2 |
Abstract
Temperature fluctuations in an atmospheric convective boundary layer are investigated by means of Large Eddy Simulations (LES). A statistical characterization for both weak temperature fluctuations and strong temperature fluctuations has been found. Despite the nontriviality of the dynamics of temperature fluctuations, our data support the idea that the most relevant statistical properties can be captured solely in terms of two scaling exponents, characterizing the entire mixed layer. Such exponents control asymptotic (i.e. core and tails) rescaling properties of the probability density functions of equal-time temperature differences, $\Delta_r \theta$, between points separated by a distance ${\bm r}$. A link between statistical properties of large temperature fluctuations and geometrical properties of the set hosting such fluctuations is also provided. Finally, a possible application of our new findings to the problem of subgrid-scale parameterizations for the temperature field in a convective boundary layer is discussed.
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"abstract": "Temperature fluctuations in an atmospheric convective boundary layer are\ninvestigated by means of Large Eddy Simulations (LES). A statistical\ncharacterization for both weak temperature fluctuations and strong temperature\nfluctuations has been found. Despite the nontriviality of the dynamics of\ntemperature fluctuations, our data support the idea that the most relevant\nstatistical properties can be captured solely in terms of two scaling\nexponents, characterizing the entire mixed layer. Such exponents control\nasymptotic (i.e. core and tails) rescaling properties of the probability\ndensity functions of equal-time temperature differences, $\\Delta_r \\theta$,\nbetween points separated by a distance ${\\bm r}$. A link between statistical\nproperties of large temperature fluctuations and geometrical properties of the\nset hosting such fluctuations is also provided. Finally, a possible application\nof our new findings to the problem of subgrid-scale parameterizations for the\ntemperature field in a convective boundary layer is discussed.",
"arxiv_id": "physics/0202047",
"authors": [
"M. Antonelli",
"A. Mazzino",
"U. Rizza"
],
"categories": [
"physics.ao-ph",
"nlin.CD",
"physics.flu-dyn"
],
"doi": "10.1175/1520-0469(2003)060\u003c0215:SOTFIA\u003e2.0.CO;2",
"title": "Statistics of temperature fluctuations in a buoyancy dominated boundary layer flow simulated by a Large-eddy simulation model",
"url": "https://arxiv.org/abs/physics/0202047"
},
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