# Resolving the fine-scale structure in turbulent Rayleigh–Bénard convection

@article{Scheel2013ResolvingTF,
title={Resolving the fine-scale structure in turbulent Rayleigh–B{\'e}nard convection},
author={Janet D. Scheel and Mohammad S. Emran and J{\"o}rg Schumacher},
journal={New Journal of Physics},
year={2013},
volume={15}
}
• Published 6 November 2013
• Physics
• New Journal of Physics
We present high-resolution direct numerical simulation studies of turbulent Rayleigh–Bénard convection in a closed cylindrical cell with an aspect ratio of one. The focus of our analysis is on the finest scales of convective turbulence, in particular the statistics of the kinetic energy and thermal dissipation rates in the bulk and the whole cell. The fluctuations of the energy dissipation field can directly be translated into a fluctuating local dissipation scale which is found to develop ever…
Temporal dynamics of large-scale structures for turbulent Rayleigh–Bénard convection in a moderate aspect-ratio cylinder
• Physics
Journal of Fluid Mechanics
• 2020
Abstract We investigate the spatial organization and temporal dynamics of large-scale, coherent structures in turbulent Rayleigh–Bénard convection via direct numerical simulation of a 6.3
Predicting transition ranges to turbulent viscous boundary layers in low Prandtl number convection flows
• Physics
• 2017
We discuss two aspects of turbulent Rayleigh-B\'{e}nard convection (RBC) on the basis of high-resolution direct numerical simulations in a unique setting; a closed cylindrical cell of aspect ratio of
Local boundary layer scales in turbulent Rayleigh–Bénard convection
• Physics
Journal of Fluid Mechanics
• 2014
Abstract We compute fully local boundary layer scales in three-dimensional turbulent Rayleigh–Bénard convection. These scales are directly connected to the highly intermittent fluctuations of the
On the evolution of flow topology in turbulent Rayleigh-Bénard convection
• Physics
• 2016
Small-scale dynamics is the spirit of turbulence physics. It implicates many attributes of flow topology evolution, coherent structures, hairpin vorticity dynamics, and mechanism of the kinetic
Transition to turbulence scaling in Rayleigh-Bénard convection
• Physics
Physical Review E
• 2018
If a fluid flow is driven by a weak Gaussian random force, the nonlinearity in the Navier-Stokes equations is negligibly small and the resulting velocity field obeys Gaussian statistics. Nonlinear
Convective mesoscale turbulence at very low Prandtl numbers
• Physics
• 2022
Horizontally extended turbulent convection, termed mesoscale convection in natural systems, remains a challenge to investigate in both experiments and simulations. This is particularly so for very
Flow topology and small-scale dynamics in turbulent rayleigh-bénard convection
Without fluid turbulence, life might have rather different look. The atmosphere and oceans could nearly maintain a much larger temperature differences resulting in ultimate heating or cooling to the
Transitional boundary layers in low-Prandtl-number convection
• Physics
• 2016
The boundary layer structure of the velocity and temperature fields in turbulent Rayleigh-Benard flows in closed cylindrical cells of unit aspect ratio is revisited from a transitional and turbulent

## References

SHOWING 1-10 OF 47 REFERENCES
Fine-scale statistics of temperature and its derivatives in convective turbulence
• Physics
Journal of Fluid Mechanics
• 2008
We study the fine-scale statistics of temperature and its derivatives in turbulent Rayleigh–Bénard convection. Direct numerical simulations are carried out in a cylindrical cell with unit aspect
Conditional statistics of thermal dissipation rate in turbulent Rayleigh-Bénard convection
• Physics
The European physical journal. E, Soft matter
• 2012
The Rayleigh number dependence of the mean moments and probability density functions of the thermal dissipation are analyzed on the subvolumes and related to other possible divisions of the convection volume, such as into boundary layer and bulk.
Universality of local dissipation scales in buoyancy-driven turbulence.
• Physics
Physical review letters
• 2010
An experimental investigation of the local dissipation scale field eta in turbulent thermal convection reveals two types of universality of eta: the small-scale dissipation dynamics in buoyancy-driven turbulence can be described by the same models developed for homogeneous and isotropic turbulence.
Possible Effects of Small-Scale Intermittency in Turbulent Reacting Flows
It is now well established that quantities such as energy dissipation, scalar dissipation and enstrophy possess huge fluctuations in turbulent flows, and that the fluctuations become increasingly
Radial boundary layer structure and Nusselt number in Rayleigh–Bénard convection
• Physics
Journal of Fluid Mechanics
• 2010
Results from direct numerical simulation (DNS) for three-dimensional Rayleigh–Bénard convection in a cylindrical cell of aspect ratio 1/2 and Prandtl number Pr=0.7 are presented. They span five
Numerical experiments on strongly turbulent thermal convection in a slender cylindrical cell
• Physics
Journal of Fluid Mechanics
• 2003
Numerical experiments are conducted to study high-Rayleigh-number convective turbulence ($Ra$ ranging from $2\times 10^6$ up to $2\times 10^{11}$) in a $\Gamma=1/2$ aspect-ratio cylindrical cell
Heat transfer and large scale dynamics in turbulent Rayleigh-Bénard convection
• Physics
• 2009
The progress in our understanding of several aspects of turbulent Rayleigh-Benard convection is reviewed. The focus is on the question of how the Nusselt number and the Reynolds number depend on the
Small-scale variation of convected quantities like temperature in turbulent fluid Part 1. General discussion and the case of small conductivity
When some external agency imposes on a fluid large-scale variations of some dynamically passive, conserved, scalar quantity θ like temperature or concentration of solute, turbulent motion of the