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15:45
15 mins
Temperature fluctuations induced by frictional heating in isotropic turbulence
Robert Chahine, Wouter Bos, Andrey Pushkarev, Robert Rubinstein
Session: Intermittency and scaling 2
Session starts: Tuesday 25 August, 15:00
Presentation starts: 15:45
Room: Room H
Robert Chahine (LMFA - CNRS - Ecole Centrale de Lyon, France)
Wouter Bos (LMFA - CNRS - Ecole Centrale de Lyon, France)
Andrey Pushkarev (ITAM, Novosibirsk State University, Russia)
Robert Rubinstein (Newport News, VA, USA)
Abstract:
The temperature fluctuations generated by viscous dissipation in an isotropic turbulent flow are studied using direct numerical simulation. It is shown that the scaling of their variance with Reynolds number is at odds with predictions from recent investigations. The origin of the discrepancy is traced back to the anomalous scaling of the dissipation rate fluctuations. Phenomenological arguments are presented which explain the observed results.