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Abstract: The work reported below is a first of its kind study of the properties ofturbulent flow without strong mean shear in a Newtonian fluid in proximity ofthe turbulent-non-turbulent interface, with emphasis on the small scaleaspects. The main tools used are a three-dimensional particle tracking system(3D-PTV) allowing to measure and follow in a Lagrangian manner the field ofvelocity derivatives and direct numerical simulations (DNS). The comparison offlow properties in the turbulent (A), intermediate (B) and non-turbulent (C)regions in the proximity of the interface allows for direct observation of thekey physical processes underlying the entrainment phenomenon. The differencesbetween small scale strain and enstrophy are striking and point to the definitescenario of turbulent entrainment via the viscous forces originating in strain.



Author: M. Holzner, A. Liberzon, N. Nikitin, W. Kinzelbach, A. Tsinober

Source: https://arxiv.org/







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