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Lagrangian statisti...
Lagrangian statistics for Navier-Stokes turbulence under Fourier-mode reduction : fractal and homogeneous decimations
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Buzzicotti, Michele (author)
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- Bhatnagar, Akshay (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Nordiska institutet för teoretisk fysik (Nordita),Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
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Biferale, Luca (author)
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Lanotte, Alessandra S. (author)
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Ray, Samriddhi Sankar (author)
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(creator_code:org_t)
- 2016-11-24
- 2016
- English.
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In: New Journal of Physics. - : Institute of Physics Publishing (IOPP). - 1367-2630. ; 18
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- isotropic and homogeneous turbulence
- multifractal theory
- Lagrangian dynamics
- intermittency
Publication and Content Type
- ref (subject category)
- art (subject category)
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