Stratified horizontal convection

Noto, Daisuke; Ulloa, Hugo N.; Yanagisawa, Takatoshi; Tasaka, Yuji

doi:10.1017/jfm.2023.625

Cited by 2 publications

(1 citation statement)

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“…The cases when the horizontal mass transfer makes a significant contribution to the dynamics and development of RDC are very widespread in the real geophysics of lakes and reservoirs, including baroclinic flows, seiche oscillations, etc. In a recent paper [43], the fluid dynamics of stratified horizontal convection were investigated experimentally, and the formation of quasi-2D circulation and a transition towards 3D coherent longitudinal roll structures similar to the ones observed in Rayleigh-Bénard-Poiseuille flow were shown. As for now, the numerical investigations of RDC including effects of the lateral transport are absent, and little is known about how the CML structure changes in lakes with the presence of lateral transport.…”

Section: Introductionmentioning

confidence: 93%

Numerical Simulation of Radiatively Driven Convection in a Small Ice-Covered Lake with a Lateral Pressure Gradient

Smirnov,

Smirnovsky,

Zdorovennova

et al. 2023

Water

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The results of a numerical simulation of radiatively driven convection (RDC) in a small ice-covered lake with a lateral pressure gradient are shown. RDC influences aquatic ecosystems as convective flow transfers heat and dissolved and suspended matter through the water column. There is a hypothesis that a continuum of convective cells with areas of ascending and descending water flows exists in a convective mixed layer (CML). Until now, little has been known about how the structure of the CML changes in lakes with lateral transport. In this work, the evolution of the CML in the computational domain with a lateral pressure gradient over several days is reproduced using an Implicit Large Eddy Simulation. We show that after a few days of lateral pressure gradient occurrence, convective cells are replaced by rolls oriented along the lateral transport direction. The change in the CML’s turbulence patterns under a lateral pressure gradient is confirmed by Anisotropic Invariant Map analysis. The study revealed a heterogeneity of pulsations of the horizontal and vertical velocity components over the entire depth of the CML and showed that when a horizontal gradient is present, the velocity pulsations generally increase.

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Section: Introductionmentioning

confidence: 93%

Numerical Simulation of Radiatively Driven Convection in a Small Ice-Covered Lake with a Lateral Pressure Gradient

Smirnov,

Smirnovsky,

Zdorovennova

et al. 2023

Water

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Plume-scale confinement on thermal convection

Noto,

Letelier,

Ulloa

2024

Proc. Natl. Acad. Sci. U.S.A.

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Despite the ubiquity of thermal convection in nature and artificial systems, we still lack a unified formulation that integrates the system’s geometry, fluid properties, and thermal forcing to characterize the transition from free to confined convective regimes. The latter is broadly relevant to understanding how convection transports energy and drives mixing across a wide range of environments, such as planetary atmospheres/oceans and hydrothermal flows through fractures, as well as engineering heatsinks and microfluidics for the control of mass and heat fluxes. Performing laboratory experiments in Hele-Shaw geometries, we find multiple transitions that are identified as remarkable shifts in flow structures and heat transport scaling, underpinning previous numerical studies. To unveil the mechanisms of the geometrically controlled transition, we focus on the smallest structure of convection, posing the following question: How free is a thermal plume in a closed system? We address this problem by proposing the degree of confinement Λ —the ratio of the thermal plume’s thickness in an unbounded domain to the lateral extent of the system—as a universal metric encapsulating all the physical parameters. Here, we characterize four convective regimes different in flow dimensionality and time dependency and demonstrate that the transitions across the regimes are well tied with Λ . The introduced metric Λ offers a unified characterization of convection in closed systems from the plume’s standpoint.

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Stratified horizontal convection

Cited by 2 publications

References 53 publications

Numerical Simulation of Radiatively Driven Convection in a Small Ice-Covered Lake with a Lateral Pressure Gradient

Numerical Simulation of Radiatively Driven Convection in a Small Ice-Covered Lake with a Lateral Pressure Gradient

Plume-scale confinement on thermal convection

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