Structure Functions and Structure Parameters of Velocity Fluctuations in Numerically Simulated Atmospheric Convective Boundary Layer Flows

Gibbs, Jeremy A.; Fedorovich, Evgeni

doi:10.1175/jas-d-20-0038.1

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Structure Functions and Structure Parameters of Velocity Fluctuations in Numerically Simulated Atmospheric Convective Boundary Layer Flows

2020
By Gibbs, Jeremy A. ; Fedorovich, Evgeni
Source: Journal of the Atmospheric Sciences, 77(10), 3619-3630

[PDF-3.48 MB]

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Journal Title:

Journal of the Atmospheric Sciences
Personal Author:

Gibbs, Jeremy A. ; Fedorovich, Evgeni

Gibbs, Jeremy A. ; Fedorovich, Evgeni Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; NSSL (National Severe Storms Laboratory)

OAR (Oceanic and Atmospheric Research) ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; NSSL (National Severe Storms Laboratory) Less -
Description:

We extend our previous study, which dealt with structure functions of potential temperature fluctuations, and focus on the characteristics of second-order velocity structure functions and corresponding structure parameters in the atmospheric convective boundary layer. We consider the three previously reported methods to compute the structure parameters of turbulent velocity fields: the direct method, the true spectral method, and the approximate spectral method. The methods are evaluated using high-resolution gridded numerical data from large-eddy simulations of shear-free and shear-driven convective boundary layers. Results indicate that the direct and true spectral methods are more suitable than the approximate spectral method, which overestimates the structure parameters of velocity as a result of assuming the inertial-subrange shape of the velocity spectrum for all turbulence scales. Results also suggest that structure parameters of vertical velocity fluctuations are of limited utility because of violations of local isotropy, especially in shear-free convective boundary layers.
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Atmospheric Science
Source:

Journal of the Atmospheric Sciences, 77(10), 3619-3630
DOI:

https://doi.org/10.1175/jas-d-20-0038.1
ISSN:

0022-4928;1520-0469;
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PDF
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American Meteorological Society
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Journal Article
Funding:

Grant no. NA11OAR4320072
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urn:sha256:da5c26fbeef17f757ce13a7d31210c74b4345d9a469ced77865e511af150bed9
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Structure Functions and Structure Parameters of Velocity Fluctuations in Numerically Simulated Atmospheric Convective Boundary Layer Flows

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