Normal mode decomposition in direct numerical simulations of rotating-stratified turbulence etc15 Tracking Number 185Presentation: Session: Geophysical and astrophysical turbulence 2 Room: Room C Session start: 15:00 Thu 27 Aug 2015 Corentin Herbert cherbert@ucar.edu Affifliation: National Center for Atmospheric Research Raffaele Marino marino@ucar.edu Affifliation: National Center for Atmospheric Research Annick Pouquet pouquet@ucar.edu Affifliation: National Center for Atmospheric Research Duane Rosenberg duaner62@gmail.com Affifliation: Oak Ridge National Laboratory Topics: - Geophysical and astrophysical turbulence Abstract: In the presence of solid-body rotation and density stratification, turbulent flows may exhibit an inverse as well as a direct cascade. We investigate the role of turbulence and waves in these energy cascades, focusing on the inverse cascade. This is done through a normal mode decomposition of the dynamical fields in a set of direct numerical simulations in terms of inertia-gravity waves and vortical modes. In agreement with theoretical arguments, we find that the vortical modes dominate the inverse cascade of energy. |