29 شهریور 1400

پویا منشور

مرتبه علمی:
نشانی: دانشکده علوم و فناوری نانو و زیستی - گروه فیزیک
تحصیلات: فیزیک
تلفن:
دانشکده: دانشکده علوم و فناوری نانو و زیستی

مشخصات پژوهش

عنوان Interoccurrence time statistics in fully developed turbulence
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
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مجله Scientific Reports
شناسه DOI 10.1038/srep27452
پژوهشگران پویا منشور (نفر اول) ، مهرناز انوری (نفر دوم) ، Nico Reinke (نفر سوم) ، Muhammad Sahimi (نفر چهارم) ، محمد رضا رحیمی تبار (نفر پنجم)

چکیده

Emergent extreme events are a key characteristic of complex dynamical systems. The main tool for detailed and deep understanding of their stochastic dynamics is the statistics of time intervals of extreme events. Analyzing extensive experimental data, we demonstrate that for the velocity time series of fully-developed turbulent flows, generated by (i) a regular grid; (ii) a cylinder; (iii) a free jet of helium, and (iv) a free jet of air with the Taylor Reynolds numbers Re_? from 166 to 893, the interoccurrence time distributions P(?) above a positive threshold Q in the inertial range is described by a universal q-exponential function, P(?)=?(2?q)[1??(1?q)?]^{1/(1?q)}, which may be due to the superstatistical nature of the occurrence of extreme events. Our analysis provides a universal description of extreme events in turbulent flows.