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Classes of Hydrodynamic and Magnetohydrodynamic Turbulent Decay
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA.
Number of Authors: 2
2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, no 5, 055102Article in journal (Refereed) Published
Abstract [en]

We perform numerical simulations of decaying hydrodynamic and magnetohydrodynamic turbulence. We classify our time-dependent solutions by their evolutionary tracks in parametric plots between instantaneous scaling exponents. We find distinct classes of solutions evolving along specific trajectories toward points on a line of self-similar solutions. These trajectories are determined by the underlying physics governing individual cases, while the infrared slope of the initial conditions plays only a limited role. In the helical case, even for a scale-invariant initial spectrum (inversely proportional to wave number k), the solution evolves along the same trajectory as for a Batchelor spectrum (proportional to k(4)).

Place, publisher, year, edition, pages
2017. Vol. 118, no 5, 055102
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-141432DOI: 10.1103/PhysRevLett.118.055102ISI: 000396415600007PubMedID: 28211738OAI: oai:DiVA.org:su-141432DiVA: diva2:1086909
Available from: 2017-04-04 Created: 2017-04-04 Last updated: 2017-04-04Bibliographically approved

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Brandenburg, Axel
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Nordic Institute for Theoretical Physics (Nordita)Department of Astronomy
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