Abstract
A self-consistent closure theory of the passive scalar turbulence has been developed on the basis of the Hessian of the scalar field, where the characteristic timescale of the scalar is properly incorporated via Lagrangian time-advancement of the Hessian. Without relying on any empirical parameter, the theory reasonably predicts the Obukhov-Corrsin spectrum of the inertial-convective range with its universal constant.
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