GSTDTAP  > 地球科学
DOI10.1175/JAS-D-17-0392.1
An Evaluation of LES Turbulence Models for Scalar Mixing in the Stratocumulus-Capped Boundary Layer
Shi, Xiaoming1; Chow, Fotini Katopodes1; Street, Robert L.2; Bryan, George H.3
2018-05-01
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2018
卷号75期号:5页码:1499-1507
文章类型Article
语种英语
国家USA
英文摘要

The stratocumulus cloud-capped boundary layer under a sharp inversion is a challenging regime for large-eddy simulation (LES). Here, data from the first research flight of the Second Dynamics and Chemistry of the Marine Stratocumulus field study are used to evaluate the effect of different LES turbulence closures. Six different turbulence models, including traditional TKE and Smagorinsky models and more advanced models that employ explicit filtering and reconstruction, are tested. The traditional models produce unrealistically thin clouds and a decoupled boundary layer as compared with other more advanced models. Traditional models rely on specified subfilter-scale (SFS) Prandtl and Schmidt numbers to obtain SFS eddy diffusivity from eddy viscosity, whereas dynamic models can compute SFS eddy diffusivity independently through dynamic procedures. The effective SFS Prandtl number in dynamic models is found to be similar to 0.5 below the cloud and similar to 10 inside the cloud layer, implying minimized mixing in the cloud. In contrast, the SFS Prandtl number in traditional models is about 1/3 throughout the entire boundary layer, suggesting spuriously strong mixing in the cloud. The SFS Schmidt number in the dynamic models also changes independently from the SFS Prandtl number, whereas in traditional models they are identical, meaning that the efficiency of the turbulent mixing of water content is forced to be the same as that of heat. Since it is very difficult to know in advance the SFS Prandtl and Schmidt numbers in a given flow, dynamic models may provide a more realistic representation of scalar mixing in LES.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000434270600008
WOS关键词LARGE-EDDY SIMULATIONS ; PRANDTL NUMBER ; ALGEBRAIC MODEL ; CONVECTION ; CLOUDS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29377
专题地球科学
作者单位1.Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA;
2.Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA;
3.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA
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GB/T 7714
Shi, Xiaoming,Chow, Fotini Katopodes,Street, Robert L.,et al. An Evaluation of LES Turbulence Models for Scalar Mixing in the Stratocumulus-Capped Boundary Layer[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(5):1499-1507.
APA Shi, Xiaoming,Chow, Fotini Katopodes,Street, Robert L.,&Bryan, George H..(2018).An Evaluation of LES Turbulence Models for Scalar Mixing in the Stratocumulus-Capped Boundary Layer.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(5),1499-1507.
MLA Shi, Xiaoming,et al."An Evaluation of LES Turbulence Models for Scalar Mixing in the Stratocumulus-Capped Boundary Layer".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.5(2018):1499-1507.
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