Transport dynamics of selfconsistent, nearmarginal driftwave turbulence. II. Characterization of transport by means of passive scalars
From theoretical and modeling points of view, following Lagrangian trajectories is the most straightforward way to characterize the transport dynamics. In real plasmas, following Lagrangian trajectories is difficult or impossible. Using a blob of passive scalar (a tracer blob) allows a quasiLagrangian view of the dynamics. Using a simple twodimensional electrostatic plasma turbulence model, this work demonstrates that the evolution of the tracers and the passive scalar field is equivalent between these two fluid transport viewpoints. When both the tracers and the passive scalar evolve in tandem and closely resemble stable distributions, namely, Gaussian distributions, the underlying turbulent transport character can be recovered from the temporal scaling of the second moments of both. This local transport approach corroborates the use of passive scalar as a turbulent transport measurement. The correspondence between the local transport character and the underlying transport is quantified for different transport regimes ranging from subdiffusive to superdiffusive. In conclusion, this correspondence is limited to the initial time periods of the spread of both the tracers and the passive scalar in the given transport regimes
 Authors:

^{[1]}
;
^{[1]};
^{[2]}
 Univ. of Alaska, Fairbanks, AK (United States)
 Univ. Carlos III, Madrid (Spain)
 Publication Date:
 Grant/Contract Number:
 FG0204ER54741
 Type:
 Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 24; Journal Issue: 7; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Research Org:
 Univ. of Alaska, Fairbanks, AK (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
 OSTI Identifier:
 1474293
 Alternate Identifier(s):
 OSTI ID: 1371792
Ogata, D., Newman, D. E., and Sánchez, R.. Transport dynamics of selfconsistent, nearmarginal driftwave turbulence. II. Characterization of transport by means of passive scalars. United States: N. p.,
Web. doi:10.1063/1.4993211.
Ogata, D., Newman, D. E., & Sánchez, R.. Transport dynamics of selfconsistent, nearmarginal driftwave turbulence. II. Characterization of transport by means of passive scalars. United States. doi:10.1063/1.4993211.
Ogata, D., Newman, D. E., and Sánchez, R.. 2017.
"Transport dynamics of selfconsistent, nearmarginal driftwave turbulence. II. Characterization of transport by means of passive scalars". United States.
doi:10.1063/1.4993211. https://www.osti.gov/servlets/purl/1474293.
@article{osti_1474293,
title = {Transport dynamics of selfconsistent, nearmarginal driftwave turbulence. II. Characterization of transport by means of passive scalars},
author = {Ogata, D. and Newman, D. E. and Sánchez, R.},
abstractNote = {From theoretical and modeling points of view, following Lagrangian trajectories is the most straightforward way to characterize the transport dynamics. In real plasmas, following Lagrangian trajectories is difficult or impossible. Using a blob of passive scalar (a tracer blob) allows a quasiLagrangian view of the dynamics. Using a simple twodimensional electrostatic plasma turbulence model, this work demonstrates that the evolution of the tracers and the passive scalar field is equivalent between these two fluid transport viewpoints. When both the tracers and the passive scalar evolve in tandem and closely resemble stable distributions, namely, Gaussian distributions, the underlying turbulent transport character can be recovered from the temporal scaling of the second moments of both. This local transport approach corroborates the use of passive scalar as a turbulent transport measurement. The correspondence between the local transport character and the underlying transport is quantified for different transport regimes ranging from subdiffusive to superdiffusive. In conclusion, this correspondence is limited to the initial time periods of the spread of both the tracers and the passive scalar in the given transport regimes},
doi = {10.1063/1.4993211},
journal = {Physics of Plasmas},
number = 7,
volume = 24,
place = {United States},
year = {2017},
month = {7}
}