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On the applicability of low-dimensional models for convective flow reversals at extreme Prandtl numbers

Author

Listed:
  • Manu Mannattil

    (Indian Institute of Technology Kanpur)

  • Ambrish Pandey

    (Indian Institute of Technology Kanpur)

  • Mahendra K. Verma

    (Indian Institute of Technology Kanpur)

  • Sagar Chakraborty

    (Indian Institute of Technology Kanpur)

Abstract

Constructing simpler models, either stochastic or deterministic, for exploring the phenomenon of flow reversals in fluid systems is in vogue across disciplines. Using direct numerical simulations and nonlinear time series analysis, we illustrate that the basic nature of flow reversals in convecting fluids can depend on the dimensionless parameters describing the system. Specifically, we find evidence of low-dimensional behavior in flow reversals occurring at zero Prandtl number, whereas we fail to find such signatures for reversals at infinite Prandtl number. Thus, even in a single system, as one varies the system parameters, one can encounter reversals that are fundamentally different in nature. Consequently, we conclude that a single general low-dimensional deterministic model cannot faithfully characterize flow reversals for every set of parameter values.

Suggested Citation

  • Manu Mannattil & Ambrish Pandey & Mahendra K. Verma & Sagar Chakraborty, 2017. "On the applicability of low-dimensional models for convective flow reversals at extreme Prandtl numbers," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(12), pages 1-9, December.
  • Handle: RePEc:spr:eurphb:v:90:y:2017:i:12:d:10.1140_epjb_e2017-80391-1
    DOI: 10.1140/epjb/e2017-80391-1
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    Statistical and Nonlinear Physics;

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