Interplay of waves and eddies in rotating stratified turbulence and the link with kinetic-potential energy partition

AMS Citation:
Marino, R., D. Rosenberg, C. Herbert, and A. Pouquet, 2015: Interplay of waves and eddies in rotating stratified turbulence and the link with kinetic-potential energy partition. Europhysics Letters, 112, 49001, doi:10.1209/0295-5075/112/49001.
Date:2015-11-01
Resource Type:article
Title:Interplay of waves and eddies in rotating stratified turbulence and the link with kinetic-potential energy partition
Abstract: The interplay between waves and eddies in stably stratified rotating flows is investigated by means of world-class direct numerical simulations using up to 30723 grid points. Strikingly, we find that the shift from vortex- to wave-dominated dynamics occurs at a wave number k R which does not depend on the Reynolds number, suggesting that the partition of energy between wave and vortical modes is not sensitive to the development of turbulence at the smaller scales. We also show that k R is comparable to the wave number at which exchanges between kinetic and potential modes stabilize at close to equipartition, emphasizing the role of potential energy, as conjectured in the atmosphere and the oceans. Moreover, k R varies as the inverse of the Froude number as explained by the scaling prediction proposed, consistently with recent observations and modeling of the Mesosphere–Lower Thermosphere and of the ocean.
Peer Review:Refereed
Copyright Information:Copyright 2015 IOP Publishing Ltd.
OpenSky citable URL: ark:/85065/d7cz38n5
Publisher's Version: 10.1209/0295-5075/112/49001
Author(s):
  • Raffaele Marino - NCAR/UCAR
  • Duane Rosenberg
  • Corentin Herbert
  • Annick Pouquet - NCAR/UCAR
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