A brief report is given of a new 20483 direct numerical simulation of the mixing of passive scalars with uniform mean gradients in forced, stationary isotropic turbulence. The Taylor-scale Reynolds number is close to 700 and Schmidt numbers of 1 and 1∕8 are considered. The data provide the most convincing evidence to date for the inertial-convective scaling. Significant departures from small-scale isotropy are sustained in conventional measures. Subject to some stringent resolution requirements, the data suggest that commonly observed differences between the intermittency of energy and scalar dissipation rates may in part be a finite-Reynolds-number effect.
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Yeung et al. (2005) studied this question.
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