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Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

TURBULENT DECAY BEHIND MULTI-SCALE AND CONVENTIONAL GRIDS

pages 1-6
DOI: 10.1615/TSFP7.540
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ABSTRACT

We investigate wind tunnel turbulence generated by a conventional and two multi-scale grids. The conventional and multi-scale grids were all designed to produce turbulence with the same integral scale, so that a direct comparison could be made between the different flows. The turbulent decay rate behind our multi-scale grids is virtually identical to that behind the equivalent conventional grid. In particular, all flows exhibit a power-law decay of energy, u2 ~ t−n, where n is very close to the classical Saffman exponent of n = 6/5. Our results are at odds with some other experiments performed on multi-scale grids, where significantly higher energy decay exponents and turbulence levels have been reported.

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