Temperature fluctuations induced by frictional heating in isotropic turbulence etc15 Tracking Number 323Presentation: Session: Intermittency and scaling 2 Room: Room H Session start: 15:00 Tue 25 Aug 2015 Robert Chahine robert.chahine@doctorant.ec-lyon.fr Affifliation: LMFA - CNRS - Ecole Centrale de Lyon, France Wouter Bos wouter.bos@ec-lyon.fr Affifliation: LMFA - CNRS - Ecole Centrale de Lyon, France Andrey Pushkarev andpushka@gmail.com Affifliation: ITAM, Novosibirsk State University, Russia Robert Rubinstein robert.rubinstein41@gmail.com Affifliation: Newport News, VA, USA Topics: - Transport and mixing, - Intermittency and scaling 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. |