NDLI: A new downscaling method for sub-grid turbulence modeling

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A new downscaling method for sub-grid turbulence modeling

Content Provider	Semantic Scholar
Author	Rottner, Lucie Baehr, Christophe Couvreux, Fleur Canut, Guylaine
Copyright Year	2016
Abstract	In this study we explore a new way to model sub-grid turbulence using particle systems. The ability of particle systems to model small scale turbulence is evaluated using high resolution numerical simulations. These high-resolution sim5 ulations have been performed with the research atmospheric model Meso-NH and averaged at larger scale from which a complete downscaling experience, via a particle system, have been performed. The particle simulations are compared to the high-resolution simulation for the representation of the 10 wind fluctuations and the turbulent kinetic energy. Despite the simplicity of the physical model used to drive the particles, the results show that particle system is able to represent the average field. It is shown that this system is able to reproduce much finer turbulent structures than the numerical 15 high-resolution simulations. In addition, this study provides an estimate of the effective spatial and temporal resolution of the numerical models. This highlights the need for higher resolution simulations to be able to evaluate the very fine turbulent structures predicted by the particle systems. Eventually 20 a study of the influence of the forcing scale on the particle system is presented.
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Alternate Webpage(s)	https://www.atmos-chem-phys-discuss.net/acp-2015-1015/acp-2015-1015.pdf
Alternate Webpage(s)	https://www.atmos-chem-phys-discuss.net/acp-2015-1015/acp-2015-1015-ED1.pdf
Alternate Webpage(s)	https://www.atmos-chem-phys.net/17/6531/2017/acp-17-6531-2017.pdf
Alternate Webpage(s)	https://www.atmos-chem-phys-discuss.net/acp-2015-1015/acp-2015-1015-manuscript-version4.pdf
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Alternate Webpage(s)	https://www.atmos-chem-phys-discuss.net/acp-2015-1015/acp-2015-1015-AR1.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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