Very fine structures in scalar mixing

Abstract

We explore very fine scales of scalar dissipation in turbulent mixing, below Kolmogorov and around Batchelor scales, by performing direct numerical simulations at much finer grid resolution than is usually adopted in the past. We consider the resolution in terms of a local, fluctuating Batchelor scale and study the effects on the tails of the probability density function and multifractal properties of the scalar dissipation. The origin and importance of these very fine-scale fluctuations are discussed. One conclusion is that they are unlikely to be related to the most intense dissipation events.

10 pages, 7 figures (low quality due to downsizing)

Cited by in corpus (17)

• Radial boundary layer structure and Nusselt number in Rayleigh-Benard convection
• On the mechanism of elasto-inertial turbulence
• Resolving the fine-scale structure in turbulent Rayleigh-Benard convection
• A multiple--resolution strategy for Direct Numerical Simulation of scalar turbulence
• Fine-scale statistics of temperature and its derivatives in convective turbulence
• Local boundary layer scales in turbulent Rayleigh-Benard convection
• Statistics and geometry of passive scalars in turbulence
• Lagrangian views on turbulent mixing of passive scalars
• Benchmarking the Multi-dimensional Stellar Implicit Code MUSIC
• Geometry of intensive scalar dissipation events in turbulence
• Scaling behavior of density gradient accelerated mixing rate in shock bubble interaction
• Links between dissipation, intermittency, and helicity in the GOY model revisited
• Fractal iso-level sets in high-Reynolds-number scalar turbulence
• Dissipation Scale Fluctuations and Chemical Reaction Rates in Turbulent Flows
• Estimating intermittency in three-dimensional Navier-Stokes turbulence
• Turbulent mesoscale convection in the Boussinesq limit and beyond
• Comparing velocity and passive scalar statistics in fluid turbulence at high Schmidt numbers and Reynolds numbers