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Article . 2004
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Anisotropic fluctuations in turbulent shear flows

Authors: JACOB, Boris Francesco; Luca Biferale; Gaetano Iuso; CASCIOLA, Carlo Massimo;

Anisotropic fluctuations in turbulent shear flows

Abstract

An experimental analysis of small-scale anisotropic fluctuations has been performed in two different flows in order to assess possible universal features of shear dominated turbulence, such as the decay rate of anisotropy at small scales and the recovery of isotropy. The two data sets—a homogeneous shear flow and a turbulent boundary layer—are characterized by turbulent Reynolds numbers in the range Reλ=230−330. The measurements in the logarithmic region of the turbulent boundary layer extend from y+=90 up to y+=350. The explicit use of the Taylor hypothesis is avoided by resorting to two-point measurements, with separation in the spanwise direction, z. Streamwise (u) and wall-normal (v) velocity components are simultaneously measured in both positions by means of cross-wire probes. This procedure allows the construction of the mixed transverse structure functions, here addressed up to order 6. According to the SO(3) formalism, the observables we selected are free of any isotropic contribution, thus allowing a direct measurement of the fully anisotropic component of the field. The results are consistent with the “exponent-only” scenario for universality, i.e., all experimental data can be fitted by fixing the same set of anisotropic scaling exponents by changing only the prefactors, for different shear intensities and boundary conditions.

Country
Italy
Keywords

fluctuations, MEAN TEMPERATURE-GRADIENT, Fluid Dynamics (physics.flu-dyn), Classical Physics (physics.class-ph), FOS: Physical sciences, SMALL-SCALE STRUCTURE, Physics - Classical Physics, Physics - Fluid Dynamics, VELOCITY, shear turbulence, Nonlinear Sciences - Chaotic Dynamics, STATISTICS, MODELLI E METODI MATEMATICI, Turbulent flows; Small scales intermittency, REYNOLDS-NUMBER, Fluid mechanics, Settore FIS/02 - FISICA TEORICA, flow instability, Chaotic Dynamics (nlin.CD), boundary layer turbulence

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
20
Average
Top 10%
Top 10%
Green
bronze
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