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Related Experiment Videos

Temperature statistics in two-dimensional stably stratified turbulence.

Scott Wunsch1, Yuan-Nan Young

  • 1Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551-0969, USA. swunsc@sandia.gov

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2002
PubMed
Summary

Stably stratified turbulence shows temperature difference statistics similar to passive scalar turbulence. This similarity, observed in simulations, suggests large-scale flow dominates temperature behavior.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Research
  • Thermodynamics

Background:

  • Turbulence is a complex phenomenon crucial in many natural and engineered systems.
  • Understanding heat transport in stratified fluids is vital for atmospheric and oceanic studies.
  • Passive scalars in turbulence provide a baseline for comparison.

Purpose of the Study:

  • To investigate the statistical properties of temperature differences in stably stratified turbulence.
  • To compare these statistics with those of passive scalars in similar turbulent flows.
  • To explore the influence of stratification strength on temperature statistics.

Main Methods:

  • Utilizing two-dimensional direct numerical simulations (DNS).
  • Analyzing probability distribution functions (PDFs) of temperature differences.

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  • Comparing simulation results across varying stratification strengths.

    • Main Results:

    • Temperature difference statistics in stably stratified turbulence are qualitatively similar to passive scalar statistics.
    • PDFs of temperature differences collapse using identical scaling laws in both cases.
    • A dependence on stratification strength was observed, but large-scale flow appears dominant.

    Conclusions:

    • Stably stratified turbulence exhibits statistical similarities to passive scalar turbulence.
    • The dominance of large-scale flow dynamics is a key factor in temperature statistics.
    • Further exploration of stratification effects on temperature values and gradients is warranted.