Second-order model for atmospheric turbulence without critical Richardson number

0554562 - MÚ 2022 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Caggio, M. - Schiavon, M. - Tampieri, F. - Bodnár, Tomáš
Second-order model for atmospheric turbulence without critical Richardson number.
Proceedings of Topical Problems of Fluid Mechanics 2021. Prague: Institute of Thermomechanics AS CR, v. v. i., 2021 - (Bodnár, T.; Neustupa, T.; Šimurda, D.), s. 8-15. ISBN 978-80-87012-76-5. ISSN 2336-5781.
[Topical Problems of Fluid Mechanics 2021. on-line (CZ), 17.02.2021-19.02.2021]
Grant CEP: GA ČR(CZ) GA19-04243S
Institucionální podpora: RVO:67985840
Klíčová slova: atmospheric boundary layer * second-order closure model * turbulence parameterisations * strong strati cation
Obor OECD: Pure mathematics
https://doi.org/10.14311/TPFM.2021.002

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.
Trvalý link: http://hdl.handle.net/11104/0329271