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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Destruction coefficients for mean dissipation rates in grid turbulence

pages 2269-2276
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2330
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ABSTRACT

The isotropic forms of the transport equations for the mean turbulent kinetic energy and scalar variance dissipation rates, ‹› and ‹χ›, suggest that the turbulent mixing (power-law) decay rates depend on the ratios G/Rλu and Gθ/Rλu, where G and Gθ are destruction coefficients of ‹› and ‹χ›, and Rλu is the Taylor microscale Reynolds number. Present measurements and review data on grid turbulence show that, while Gθ/Rλu is nearer to its asymptote than G/Rλu, both ratios asymptote at Rλu ≈ 103, which should correspond to a state of complete self-preservation for the velocity and the passive scalar fields.

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