Flow reversals in turbulent convection via vortex reconnections
arXiv:1207.4521 · doi:10.1103/PhysRevLett.110.114503
Abstract
We employ detailed numerical simulations to probe the mechanism of flow reversals in two-dimensional turbulent convection. We show that the reversals occur via vortex reconnection of two attracting corner rolls having same sign of vorticity, thus leading to major restructuring of the flow. Large fluctuations in heat transport are observed during the reversal due to this flow reconfiguration. The flow configurations during the reversals have been analyzed quantitatively using large-scale modes. Using these tools, we also show why flow reversals occur for a restricted range of Rayleigh and Prandt numbers.
References in corpus (3)
Cited by in corpus (26)
- Phenomenology of buoyancy-driven turbulence: recent results
- Correlation of internal flow structure with heat transfer efficiency in turbulent Rayleigh-Bénard convection
- Counter-gradient heat transport in two-dimensional turbulent Rayleigh-Bénard convection
- Tristable flow states and reversal of the large-scale circulation in two-dimensional circular convection cells
- Wall-sheared thermal convection: heat transfer enhancement and turbulence relaminarization
- Dynamics of reversals and condensates in 2D Kolmogorov flows
- Flow reversals in turbulent convection with free-slip walls
- Thermal boundary layer structure in low-Prandtl-number turbulent convection
- Transient flows and reorientations of large-scale convection in a cubic cell
- Similarities between 2D and 3D convection for large Prandtl number
- Large-eddy simulation of Rayleigh-Bénard convection at extreme Rayleigh numbers
- Heat transfer enhancement in Rayleigh-Bénard convection using a single passive barrier
- Non-Boussinesq convection at low Prandtl numbers relevant to the Sun
- Dynamics and Statistics of Reorientations of Large-Scale Circulation in Turbulent Rotating Rayleigh-Bénard Convection
- On the Applicability of Low-Dimensional Models for Convective Flow Reversals at Extreme Prandtl Numbers
- Zonal flow reversals in two-dimensional Rayleigh-Bénard convection
- Extreme dissipation event due to plume collision in a turbulent convection cell
- Staircase solutions and stability in vertically confined salt-finger convection
- Reversals in infinite-Prandtl-number Rayleigh-Bénard convection
- Stability Analysis of Convection in the Intracluster Medium
- Role of Bulk flow in Turbulent Convection
- Influence of plume activity on thermal convection in a rectangular cell
- Bifurcation analysis of two-dimensional Rayleigh--Bénard convection using deflation
- Discrete Symmetries in Dynamo Reversals
- Reorientation of large-scale circulation of turbulent Rayleigh-Bénard convection in a cubic cell
- Data-driven prediction of reversal of large-scale circulation in turbulent convection