Power-law behavior of power spectra in low prandtl number Rayleigh-Bénard convection

M. R. Paul, M. C. Cross, P. F. Fischer, H. S. Greenside

Research output: Contribution to journalArticlepeer-review

Abstract

The origin of the power-law decay measured in the power spectra of low Prandtl number Rayleigh-B�nard convection near the onset of chaos is addressed using long time numerical simulations of the three-dimensional Boussinesq equations in cylindrical domains. The power law is found to arise from quasidiscontinuous changes in the slope of the time series of the heat transport associated with the nucleation of dislocation pairs and roll pinch-off events. For larger frequencies, the power spectra decay exponentially as expected for time continuous deterministic dynamics.

Original languageEnglish (US)
Pages (from-to)154501-154501-4
JournalPhysical review letters
Volume87
Issue number15
DOIs
StatePublished - Oct 8 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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