Turbulent flux and the diffusion of passive tracers in electrostatic turbulence

R. Basu; T. Jessen; V. Naulin; J. Juul Rasmussen

doi:10.1063/1.1578075

Turbulent flux and the diffusion of passive tracers in electrostatic turbulence

R. Basu, T. Jessen, V. Naulin, J. Juul Rasmussen

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Abstract

The connection between the diffusion of passive tracer particles and the anomalous turbulent flux in electrostatic drift-wave turbulence is investigated by direct numerical solutions of the 2D Hasegawa-Wakatani equations. The probability density functions for the point-wise and flux surface averaged turbulent particle flux are measured and compare well to a folded Gaussian, respectively a log-normal distribution. By following a large number of passive tracer particles we evaluate the diffusion coefficient based on the particle dispersion. It is found that the particle diffusion coefficient is in good agreement with the one derived from the turbulent ExB-flux by using Fick's law. Employing the Lagrangian conservation of the "Potential Vorticity'' in the Hasegawa-Wakatani equations, the analytical support for this result is obtained. The transport estimated by passive tracer dispersion and turbulent plasma flux are found to coincide. (C) 2003 American Institute of Physics.

Original language	English
Journal	Physics of Plasmas
Volume	10
Issue number	7
Pages (from-to)	2696-2703
ISSN	1070-664X
DOIs	https://doi.org/10.1063/1.1578075
Publication status	Published - 2003

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title = "Turbulent flux and the diffusion of passive tracers in electrostatic turbulence",

abstract = "The connection between the diffusion of passive tracer particles and the anomalous turbulent flux in electrostatic drift-wave turbulence is investigated by direct numerical solutions of the 2D Hasegawa-Wakatani equations. The probability density functions for the point-wise and flux surface averaged turbulent particle flux are measured and compare well to a folded Gaussian, respectively a log-normal distribution. By following a large number of passive tracer particles we evaluate the diffusion coefficient based on the particle dispersion. It is found that the particle diffusion coefficient is in good agreement with the one derived from the turbulent ExB-flux by using Fick's law. Employing the Lagrangian conservation of the {"}Potential Vorticity'' in the Hasegawa-Wakatani equations, the analytical support for this result is obtained. The transport estimated by passive tracer dispersion and turbulent plasma flux are found to coincide. (C) 2003 American Institute of Physics.",

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T1 - Turbulent flux and the diffusion of passive tracers in electrostatic turbulence

AU - Basu, R.

AU - Jessen, T.

AU - Naulin, V.

AU - Juul Rasmussen, J.

PY - 2003

Y1 - 2003

N2 - The connection between the diffusion of passive tracer particles and the anomalous turbulent flux in electrostatic drift-wave turbulence is investigated by direct numerical solutions of the 2D Hasegawa-Wakatani equations. The probability density functions for the point-wise and flux surface averaged turbulent particle flux are measured and compare well to a folded Gaussian, respectively a log-normal distribution. By following a large number of passive tracer particles we evaluate the diffusion coefficient based on the particle dispersion. It is found that the particle diffusion coefficient is in good agreement with the one derived from the turbulent ExB-flux by using Fick's law. Employing the Lagrangian conservation of the "Potential Vorticity'' in the Hasegawa-Wakatani equations, the analytical support for this result is obtained. The transport estimated by passive tracer dispersion and turbulent plasma flux are found to coincide. (C) 2003 American Institute of Physics.

AB - The connection between the diffusion of passive tracer particles and the anomalous turbulent flux in electrostatic drift-wave turbulence is investigated by direct numerical solutions of the 2D Hasegawa-Wakatani equations. The probability density functions for the point-wise and flux surface averaged turbulent particle flux are measured and compare well to a folded Gaussian, respectively a log-normal distribution. By following a large number of passive tracer particles we evaluate the diffusion coefficient based on the particle dispersion. It is found that the particle diffusion coefficient is in good agreement with the one derived from the turbulent ExB-flux by using Fick's law. Employing the Lagrangian conservation of the "Potential Vorticity'' in the Hasegawa-Wakatani equations, the analytical support for this result is obtained. The transport estimated by passive tracer dispersion and turbulent plasma flux are found to coincide. (C) 2003 American Institute of Physics.

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DO - 10.1063/1.1578075

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SN - 1070-664X

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SP - 2696

EP - 2703

JO - Physics of Plasmas

JF - Physics of Plasmas

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Turbulent flux and the diffusion of passive tracers in electrostatic turbulence

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