Journal
TOPICAL PROBLEMS OF FLUID MECHANICS 2021
Volume -, Issue -, Pages 8-15Publisher
ACAD SCI CZECH REPUBLIC, INST THERMOMECHANICS
DOI: 10.14311/TPFM.2021.002
Keywords
Atmospheric boundary layer; second-order closure model; turbulence parameterisations; strong stratification; critical Richardson number
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Funding
- Croatian Science Foundation [IP-2019-04-1140]
- Czech Science Foundation [P201-19-04243S]
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The purpose of this communication is to present a derivation of the non-dimensional vertical gradients of the mean wind speed and mean potential temperature for very stable atmospheric conditions. The analysis is based on second-order model equations in boundary layer approximations with proposed new heat flux equations. The model uses a recent closure for the pressure-temperature correlation, avoiding issues related to the critical threshold for the Richardson number.
The purpose of this communication is to present a derivation of the non-dimensional vertical gradients of the mean wind speed and mean potential temperature expressed in terms of the so-called similarity functions for very stable conditions of the atmosphere where theoretical approaches provide conflicting results (see e.g. Luhar et al. [19]). The result is based on the analysis of the second-order model equations in the boundary layer approximations in which new heat flux equations are proposed. The model employs a recent closure for the pressure-temperature correlation, avoiding the issue of a critical treshold for the Richardson number.
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