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Title: Lagrangian statistics in weakly forced two-dimensional turbulence

Journal Article · · Chaos: An Interdisciplinary Journal of Nonlinear Science
DOI:https://doi.org/10.1063/1.4937163· OSTI ID:1351187
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Measurements of Lagrangian single-point and multiple-point statistics in a quasi-two-dimensional stratified layer system are reported. The system consists of a layer of salt water over an immiscible layer of Fluorinert and is forced electromagnetically so that mean-squared vorticity is injected at a well-defined spatial scale ri. Simultaneous cascades develop in which enstrophy flows predominately to small scales whereas energy cascades, on average, to larger scales. Lagrangian correlations and one- and two-point displacements are measured for random initial conditions and for initial positions within topological centers and saddles. Some of the behavior of these quantities can be understood in terms of the trapping characteristics of long-lived centers, the slow motion near strong saddles, and the rapid fluctuations outside of either centers or saddles. We also present statistics of Lagrangian velocity fluctuations using energy spectra in frequency space and structure functions in real space. We compare with complementary Eulerian velocity statistics. We find that simultaneous inverse energy and enstrophy ranges present in spectra are not directly echoed in real-space moments of velocity difference. Nevertheless, the spectral ranges line up well with features of moment ratios, indicating that although the moments are not exhibiting unambiguous scaling, the behavior of the probability distribution functions is changing over short ranges of length scales. Furthermore, implications for understanding weakly forced 2D turbulence with simultaneous inverse and direct cascades are discussed.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396; W-7405-ENG-36
OSTI ID:
1351187
Alternate ID(s):
OSTI ID: 1234931
Report Number(s):
LA-UR-15-27458
Journal Information:
Chaos: An Interdisciplinary Journal of Nonlinear Science, Vol. 26, Issue 1; ISSN 1054-1500
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (3)

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Two-dimensional turbulence dispersion in a closed domain: Influence of confinement and geometry journal March 2019
Implicit molecular stresses in weakly compressible particle-based discretization methods for fluid flow journal March 2021