Physical Review Journal Club: Stability of Waves in Rotating Fluids

In rotating fluids, inertial waves are a fundamental feature of the dynamics and play an important role in geophysical and astrophysical flows. Understanding when these waves remain stable and when they break down is essential for clarifying how energy is transferred across scales and how rotating turbulence develops. Using Floquet analysis together with direct numerical simulations, authors Valentin Skoutnev, Aurélie Astoul, and Adrian J. Barker examine the stability and nonlinear breakdown of finite-amplitude propagating plane inertial waves. They identify the unstable perturbations as a function of wave amplitude and frequency, and show how the nonlinear development can lead either to forward energy transfer or to the emergence of long-lived geostrophic modes. The results provide new insight into the mechanisms governing instability, wave breakdown, and energy redistribution in rotating flows. Read ahead: https://journals.aps.org/prfluids/abs...