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Recently, Shete et al. [Phys. Rev. Fluids 7, 024601 (2022)] explored thecharacteristics of passive scalars in the presence of a uniform mean gradient,mixed by stationary isotropic turbulence. They concluded that at high Reynoldsand Schmidt numbers, the presence of both inertial-convective andviscous-convective ranges, renders the statistics of the scalar and velocityfluctuations to behave similarly. However, their data included Schmidt numbersof 0.1, 0.7, 1.0 and 7.0, only the last of which can (at best) be regarded asmoderately high. Additionally, they do not consider already available data inthe literature at substantially higher Schmidt number of up to 512. Byincluding these data, we demonstrate here that the differences between velocityand scalar statistics show no vanishing trends with increasing Reynolds andSchmidt numbers, and essential differences remain in tact at all Reynolds andSchmidt numbers.

Comparing velocity and passive scalar statistics in fluid turbulence at high Schmidt numbers and Reynolds numbers