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Descripción
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| The inherent multi-dimensional nature of the turbulent cascade is a major challenge to its study. In order to characterize a process occurring in space, time and scale, we present a new approach where we track coherent structures representing energy in different scales from a time-resolved simulation of isotropic turbulence lasting 66 large-eddy turnovers. We couple the dynamics at different scales by computing the geometric intersection between individual coherent structures from any two scales. Statistically, we find that eddies at scale r intersect those at scales 2r and r/2 preferentially at the beginning and at the end of their life, respectively. With our simulation at Re?=315, we could check this trend to hold for r values spanning a ratio of 8. We thus report on 4 generations of eddies that trace the transfer of energy from scale 8r to scale r via intermediate steps through a scale-local, spatially-localized process. We found the geometric intersection between scales separated by ratios of 4 or larger to be of the same order of magnitude as the random intersection levels found for those scale combinations. | |
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Internacional
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Si |
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Nombre congreso
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American Physical Society, 70th Annual Meeting of the APS Division of Fluid Dynamics, November 19-21, 2017 |
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Tipo de participación
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960 |
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Lugar del congreso
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Denver (CO), USA |
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Revisores
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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19/11/2017 |
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Fecha fin congreso
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21/11/2017 |
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Desde la página
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Hasta la página
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Título de las actas
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http://meetings.aps.org/Meeting/DFD17/Session/L19.8 |