Calculation of Higher-Order Moments in the Atmospheric Boundary Layer
| Autor: | B. B. Ilyushin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Environmental Engineering 010504 meteorology & atmospheric sciences Turbulence Planetary boundary layer Energy Engineering and Power Technology Boundary (topology) Mechanics Condensed Matter Physics 01 natural sciences Convective Boundary Layer Vortex Modeling and Simulation Diffusion (business) Reynolds-averaged Navier–Stokes equations Cumulant 0105 earth and related environmental sciences |
| Zdroj: | Journal of Engineering Thermophysics. 27:339-344 |
| ISSN: | 1990-5432 1810-2328 |
| DOI: | 10.1134/s1810232818030098 |
| Popis: | The results of analyzing a number of models to calculate the statistical fourth-order moments of turbulent fluctuations of vertical velocity and temperature, which describe diffusion processes in equations for triple correlations in RANS models, are presented. Correct calculation of higher-order moments allows adequate description of the impact of large-scale vortex structures on the vertical flow of turbulence energy, as well as the impact of chemical reactions (in the case of reactive impurities) and/or phase transitions (moisture condensation and evaporation) in the atmospheric boundary layer.Results of calculations with the use of the quasi-normality hypothesis, a number of empirical formulas. and algebraic models for fourth-order cumulants are comparedwith in situ measurements in the convective boundary layer of the atmosphere. It is shown that the secondorder- closure models, which are much more efficient in numerical implementation than the thirdorder models, predict the behavior of the higher-order moments not worse than the latter. |
| Databáze: | OpenAIRE |
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