| Autor: |
Buzzicotti, Michele, Bhatnagar, Akshay, Biferale, Luca, Lanotte, Alessandra S., Ray, Samriddhi Sankar |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
New J. Phys. 18 113047 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1088/1367-2630/18/11/113047 |
| Popis: |
We study small-scale and high-frequency turbulent fluctuations in three-dimensional flows under Fourier-mode reduction. The Navier-Stokes equations are evolved on a restricted set of modes, obtained as a projection on a fractal or homogeneous Fourier set. We find a strong sensitivity (reduction) of the high-frequency variability of the Lagrangian velocity fluctuations on the degree of mode decimation, similarly to what is already reported for Eulerian statistics. This is quantified by a tendency towards a quasi-Gaussian statistics, i.e., to a reduction of intermittency, at all scales and frequencies. This can be attributed to a strong depletion of vortex filaments and of the vortex stretching mechanism. Nevertheless, we found that Eulerian and Lagrangian ensembles are still connected by a dimensional bridge-relation which is independent of the degree of Fourier-mode decimation. |
| Databáze: |
arXiv |
| Externí odkaz: |
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