Multiscale Mixing Efficiencies for Steady Sources

Abstract

Multiscale mixing efficiencies for passive scalar advection are defined in terms of the suppression of variance weighted at various length scales. We consider scalars maintained by temporally steady but spatially inhomogeneous sources, stirred by statistically homogeneous and isotropic incompressible flows including fully developed turbulence. The mixing efficiencies are rigorously bounded in terms of the Peclet number and specific quantitative features of the source. Scaling exponents for the bounds at high Peclet number depend on the spectrum of length scales in the source, indicating that molecular diffusion plays a more important quantitative role than that implied by classical eddy diffusion theories.

4 pages, 1 figure. RevTex4 format with psfrag macros. Final version

References in corpus (2)

• Particles and fields in fluid turbulence
• A Bound on Mixing Efficiency for the Advection-Diffusion Equation

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