作者: Mahesh M Bandi
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摘要: Experiment 1 studies finite system size effects on temporal energy flux fluctuations in three-dimensional (3D) incompressible turbulence. The measured instantaneous shows that the turbulent transfer proceeds towards small spatial scales average but frequently reverses direction (backscatter) to travel larger scales. frequency of backscatter events is studied experimentally and through simulations. In 2 third-order Eulerian structure function for compressible turbulence a free surface first time, found scale linearly space agrees well with Kolmogorov's theory 1941 (K41). K41 predicts second-order Lagrangian should time. However experimental measurements show it instead as power-law exponent 1/2. 3 concerns measurement entropy production rate steady-state analysis relies recent Falkovich Fouxon. expected equal time integral lagrangian velocity divergence correlation negative prefactor. results are disagree this prediction. addition, if highly chaotic (follows SRB statistics), system's equals sum its Lyapunov exponents. exponents obtained from simulations by Boffetta et. al. under flow conditions similar experiment. 4 presents test Steady-State Fluctuation Theorem Gallavotti Cohen statistics collected individual trajectories experiment 3. excellent agreement within limited interval probability distributions window averaging times.