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Experimental analysis of transverse intermittency in a turbulent jet flow (1997)

Camussi, R. ; Barbagallo, D. ; Guj, G.

Springer

Experiments in fluids 22 (1997), S. 268-270

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ISSN: 1432-1114

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The statistical properties of the velocity differences are experimentally investigated in a turbulent jet-flow at moderate Re λ by X-probe hot wire anemometry measurements. It is found that the traverse velocity components show a more intermittent behavior with respect to the longitudinal ones. This result is obtained by the analysis of the longitudinal and transverse intermittency exponents measured by the Extended Self-Similarity form of scaling, and by the comparison of the longitudinal and transverse velocity difference Probability Distribution Functions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003480050047

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Transverse and longitudinal scaling laws in non-homogeneous low Re turbulence (1996)

Camussi, R. ; Barbagallo, D. ; Guj, G. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 8 (1996), S. 1181-1191

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ISSN: 1089-7666

Source: AIP Digital Archive

Topics: Physics

Notes: The statistical properties of the velocity fluctuation components at moderate Reλ are studied in homogeneous and non-homogeneous turbulence by an experimental technique. Measurements are performed by means of a hot-wire anemometer with X-probe downstream of a screen for several positions, x/M=9 up to 109, where M is the screen mesh size, with Reλ ranging from 37 to 82. The homogeneity of the flow is analyzed by means of velocity measurements in different transverse positions and a direct evaluation of the local isotropy of the flow is performed by means of velocity spectra. The scaling properties of the statistical moments of the structure functions up to the order of six, are investigated in the extreme positions by means of the extended self-similarity (ESS) method and the intermittency exponents are detected for both homogeneous and non-homogeneous flow conditions. A comparison of the longitudinal and transverse intermittency exponents as functions of the position is then performed and discussed in addition to the analysis of the transition from the anomalous to a regular scaling for small spatial separation. © 1996 American Institute of Physics.