2004/01/29 by A. Bershadskii, Joseph Niemela, J. J. Niemela +4
Engineering · Environmental Science · Physics and Astronomy · #Combustion and flame dynamics #Fluid Dynamics and Turbulent Flows #Wind and Air Flow Studies #nlin.CD
paper · pdf · doi:10.1103/physreve.69.056314
published as Physical Review E, 69 (2004) 056314
arxiv created 2004/01/29 · openalex publication_date 2004/05/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Temperature time traces are obtained in turbulent thermal convection at high Rayleigh numbers. Measurements are made in the midplane of the apparatus, near the sidewall but outside the boundary layer. A telegraph approximation for temperature traces is generated by setting the fluctuation amplitude to 1 or 0 depending on whether or not it exceeds the mean value. Unlike the standard diagnostics of intermittency, the telegraph approximation allows one to distinguish the tendency of events to cluster (clusterization) from their large-scale variability in amplitude. A qualitative conclusion is that amplitude intermittency might mitigate clusterization effects.