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Destruction coefficients for mean dissipation rates in grid turbulence

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

Soon Kong Lee
School of Engineering, University of Newcastle, NSW, 2308, Australia

Lyazid Djenidi
Discipline of Mechanical Engineering, University of Newcastle, Newcastle, 2308, NSW, AUSTRALIA

Robert Anthony Antonia
Discipline of Mechanical Engineering, University of Newcastle, Newcastle, 2308, NSW, AUSTRALIA

Sinopsis

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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