The effects of aspect ratio on flow states and heat transport in vertical convection

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In two-dimensional vertical convection, for a fixed aspect ratio, the flow evolves from steady convection to periodic oscillations, chaotic flows, and finally turbulence as the Rayleigh number increases. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Ning Wei; Jing-Zhi Gao; Yi-Chao Xie

doi:10.1017/jfm.2026.11926

September 1, 2026Journal of Fluid Mechanics

The effects of aspect ratio on flow states and heat transport in vertical convection

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Key Points

To investigate how the aspect ratio influences the evolution of flow regimes and heat transport dynamics in two-dimensional vertical convection.
Conducted two-dimensional direct numerical simulations of vertical convection.
Evaluated flow fields across a Rayleigh number range of 10^7 to 10^11 at a fixed Prandtl number of 1.
Systematically varied the cavity aspect ratio from 1/50 to 8.
Increasing the Rayleigh number at a fixed aspect ratio drives the flow transition from steady convection to periodic oscillations, chaotic flow, and ultimately turbulence.
Cavity aspect ratio directly modulates the critical thresholds for flow instability and the overall rate of convective heat transport.

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Implication

Numerical simulation study reveals flow transitions from steady state to turbulence across varied aspect ratios in vertical convection, highlighting geometry's role in heat transfer.

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Cite This Study

Wei et al. (2026) studied this question.

synapsesocial.com/papers/6a99352e636c6408cfa7d34b https://doi.org/10.1017/jfm.2026.11926

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The effects of aspect ratio on flow states and heat transport in vertical convection

Key Points

No abstract yet

Implication

Discussion

Cite This Study

The effects of aspect ratio on flow states and heat transport in vertical convection

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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