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Department of Mechanical Engineering
McGill University
Abstract-
Presented are statistics of the mixed velocity-passive scalar field in quasi-isotropic decaying grid turbulence with an
imposed mean scalar gradient. The Reynolds number dependence of the mixed statistics is considered along with
their consistency with the notion of local isotropy. Particular emphasis is placed on the third-order mixed structure
function, the behavior of which is governed by Yaglom's equation. Deviations from this theoretical prediction are
accounted for by means of a generalized Yaglom's equation. The latter includes the effect of the non-stationarity of
the turbulent scalar fluctuations and their production by the mean scalar gradient. The experimental data supports the
generalized equation.
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