eng
Second-order model for atmospheric turbulence without critical Richardson number
nusl-508506
Caggio, M.
Schiavon, M.
Tampieri, F.
Bodnár, Tomáš
Topical Problems of Fluid Mechanics 2021
on-line (CZ)
20210217
GA19-04243S
GA ČR
2021
atmospheric boundary layer
second-order closure model
turbulence parameterisations
strong strati cation
http://hdl.handle.net/11104/0329271
http://www.nusl.cz/ntk/nusl-508506
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.
8 s.
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