Journal article

On triadic resonance as an instability mechanism in precessing cylinder flow

T Albrecht, HM Blackburn, JM Lopez, R Manasseh, P Meunier

Journal of Fluid Mechanics | Published : 2018

Abstract

Contained rotating flows subject to precessional forcing are well known to exhibit rapid and energetic transitions to disorder. Triadic resonance of inertial modes has been previously proposed as an instability mechanism in such flows, and that idea was developed into a successful model for predicting instability in a cylindrical container when departures from solid-body rotation are sufficiently small. Using direct numerical simulation and dynamic mode decomposition, we analyse instabilities of precessing cylinder flows whose three-dimensional basic states, steady in the gimbal frame of reference, may depart substantially from solid-body rotation. In the gimbal frame, the instability can be..

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University of Melbourne Researchers

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