Journal article

Horizontal convection dynamics: insights from transient adjustment

Ross W Griffiths, Graham O Hughes, Bishakhdatta Gayen

JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2013

Abstract

The dynamics of horizontal convection are revealed by examining transient adjustment toward thermal equilibrium. We restrict attention to high Rayleigh numbers (of $O(1{0}^{12} )$) and a Prandtl number ${\sim }5$ that characterize many practical applications, and consider responses to small changes in the thermal boundary conditions, using laboratory experiments, three-dimensional direct numerical simulations (DNS) and simple theoretical models. The experiments and the mechanical energy budget from the DNS demonstrate that unsteady forcing can produce flow dramatically more active than horizontal convection under steady forcing. The physical mechanisms at work are indicated b..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Awarded by ARC Future Fellowship


Funding Acknowledgements

We thank T. Beasley for construction and assistance with the laboratory experiments. This work was funded by the Australian Research Council (DP1094542 and DP120102744), and the numerical simulations were supported by time allocation on the National Computing Infrastructure at The Australian National University. G.O.H. was supported by an ARC Future Fellowship (FT100100869). Research Interns K. Burke, R. Holmes, S. Jaspers and C. Wong assisted in the experimental program.