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arXiv · 2609.33961

PV-Wave Decomposition and Combined Wave Effects for Stratified Couette Flows

Yiting Yao
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Abstract

Motivated by a class of three-component Fourier ODE systems consisting of a conserved mode coupled to a pair of oscillatory modes, we develop a "potential-vorticity-wave" (PV-Wave) decomposition strategy for constructing adapted energy variables in the stability analysis of Couette flows. The strategy separates the conserved potential-vorticity component, symmetrizes the remaining wave subsystem, and introduces an additional correction to control the couplings generated by time-dependent Fourier coefficients. We apply this framework to study the linearized dynamics of 3D Boussinesq MHD system and Rotating Boussinesq system for Couette flows and quantify the inviscid damping and parameter-dependent amplification arising from the interaction of Alfvén-gravity waves and inertial-gravity waves.

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Yiting Yao. 2026-09-27. PV-Wave Decomposition and Combined Wave Effects for Stratified Couette Flows. https://arxiv.org/abs/2609.33961

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