Calculation of Higher-Order Moments in the Atmospheric Boundary Layer

B. B. Ilyushin

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование


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.

Язык оригиналаанглийский
Страницы (с-по)339-344
Число страниц6
ЖурналJournal of Engineering Thermophysics
Номер выпуска3
СостояниеОпубликовано - 1 июл 2018


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