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pro vyhledávání: '"KATUL, GABRIEL"'
The attached-eddy model (AEM) predicts mean velocity and streamwise velocity variance profiles that follow a logarithmic shape in the overlap region of high Reynolds number wall-bounded turbulent flows. Moreover, the AEM coefficients are presumed to
Externí odkaz:
http://arxiv.org/abs/2411.02756
Autor:
Buono, Elia, Katul, Gabriel, Heisel, Michael, Poggi, Davide, Peruzzi, Cosimo, Vettori, Davide, Manes, Costantino
One of the main statistical features of near-neutral atmospheric boundary layer (ABL) turbulence is the positive vertical velocity skewness $Sk_w$ above the roughness sublayer or the buffer region in smooth-walls. The $Sk_w$ variations are receiving
Externí odkaz:
http://arxiv.org/abs/2408.11887
Autor:
Buono, Elia, Katul, Gabriel, Heisel, Michael, Vettori, Davide, Poggi, Davide, Peruzzi, Cosimo, Manes, Costantino
We provide empirical evidence that within the inertial sub layer of adiabatic turbulent flows over smooth walls, the skewness of the vertical velocity component $Sk_w$ displays universal behaviour, being constant and constrained within the range $Sk_
Externí odkaz:
http://arxiv.org/abs/2407.05955
Turbulent flows over a large surface area (S) covered by n obstacles experience an overall drag due to the presence of the ground and the protruding obstacles into the flow. The drag partition between the roughness obstacles and the ground is analyze
Externí odkaz:
http://arxiv.org/abs/2404.07893
The drag coefficient $C_d$ for a rigid and uniformly distributed rod canopy covering a sloping channel following the instantaneous collapse of a dam was examined using flume experiments. The measurements included space $x$ and time $t$ high resolutio
Externí odkaz:
http://arxiv.org/abs/2403.12232
Autor:
Allouche, Mohammad, Sevostianov, Vladislav I., Zahn, Einara, Zondlo, Mark, Dias, Nelson Luís, Katul, Gabriel G., Fuentes, Jose D., Bou-Zeid, Elie
Conventional and recently developed approaches for estimating turbulent scalar fluxes under stable conditions are evaluated. The focus is on methods that do not require fast scalar sensors such as the relaxed eddy accumulation (REA) approach, the dis
Externí odkaz:
http://arxiv.org/abs/2401.11756
A generalized logarithmic law for high-order moments of passive scalars is proposed for turbulent boundary layers. This law is analogous to the generalized log law that has been proposed for high-order moments of the turbulent longitudinal velocity a
Externí odkaz:
http://arxiv.org/abs/2212.04987
Publikováno v:
Boundary-Layer Meteorol. 186 (2023), 533-565
A persistent spatial organization of eddies is identified in the lowest portion of the stably-stratified planetary boundary layer. The analysis uses flow realizations from published large-eddy simulations (Sullivan et al., J Atmos Sci 73(4):1815-1840
Externí odkaz:
http://arxiv.org/abs/2207.10755
Publikováno v:
In Advances in Water Resources January 2025 195
Autor:
Li, Shuolin, Katul, Gabriel
Drawing on an analogy to critical phenomena, it was shown that the Nikuradse turbulent friction factor ($f_t$) measurements in pipes of radius $R$ and wall roughness $r$ can be collapsed onto a one-dimensional curve expressed as a conveyance law $f_t
Externí odkaz:
http://arxiv.org/abs/2109.00628