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- W4300623911 abstract "An experimental investigation of freely decaying homogeneous, quasi-isotropic turbulence generated by a low-blockage space-filling fractal square grid is presented. We find good agreement with previous work by Mazellier & Vassilicos [Turbulence without the Richardson-Kolmogorov cascade, Phys. Fluids 22, 075101 (2010)] but also extend the length of the assessed decay region and consolidate the results by repeating the experiments with a second probe of increased spatial resolution. It is confirmed that this moderately high Reynolds number turbulence (150 < Reλ < 400) does not follow the classical high Reynolds number scaling of the dissipation rate ε ~ u'3/L which is in fact equivalent to a proportionality between the Taylor-based Reynolds number Reλ and the ratio of integral scale L to Taylor micro-scale λ. Instead we observe a constant ratio L/λ whilst Reλ decays during free turbulence decay. Alternative reasons for this non-classical behaviour are discussed, including various ways in which the turbulence may fall into a self-preserving, single-length-scale state. It is also shown that the measured 3D energy spectra can be reasonably collapsed using a single length-scale over the entire decay region even though the Reynolds number is high enough for conventional decaying turbulence to display spectra with two-scale (inner and outer) Kolmogorov scaling." @default.
- W4300623911 created "2022-10-03" @default.
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- W4300623911 date "2011-01-01" @default.
- W4300623911 modified "2023-10-14" @default.
- W4300623911 title "THE DECAY OF HOMOGENEOUS TURBULENCE GENERATED BY MULTI-SCALE GRIDS" @default.
- W4300623911 doi "https://doi.org/10.1615/tsfp7.530" @default.
- W4300623911 hasPublicationYear "2011" @default.
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