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Intermittency, dissipation, and scaling in two-dimensional magnetohydrodynamic turbulence
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Merrifield, J. A., Chapman, Sandra C. and Dendy, R. O. (2007) Intermittency, dissipation, and scaling in two-dimensional magnetohydrodynamic turbulence. Physics of Plasmas, Volume 14 (Number 1). doi:10.1063/1.2409528 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.2409528
Abstract
Direct numerical simulations (DNS) provide a means to test phenomenological models for the scaling properties of intermittent MHD turbulence. The well-known model of She and Leveque, when generalized to MHD, is in good agreement with the DNS in three dimensions, however, it does not coincide with DNS in two dimensions (2D). This is resolved here using the results of recent DNS of driven MHD turbulence in 2D which directly determine the scaling of the rate of dissipation. Specifically, a simple modification to generalized refined similarity is proposed that captures the results of the 2D MHD simulations. This leads to a new generalization of She and Leveque in MHD that is coincident with the DNS results in 2D. A key feature of this model is that the most intensely dissipating structures, which are responsible for the intermittency, are thread-like in 2D, independent of whether the underlying phenomenology of the cascade is Kolmogorov or Iroshnikov Kraichnan.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | January 2007 | ||||
| Dates: |
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| Volume: | Volume 14 | ||||
| Number: | Number 1 | ||||
| Number of Pages: | 5 | ||||
| DOI: | 10.1063/1.2409528 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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