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Computing Lagrangian means (2023)
Journal Article
Kafiabad, H. A., & Vanneste, J. (2023). Computing Lagrangian means. Journal of Fluid Mechanics, 960, Article A36. https://doi.org/10.1017/jfm.2023.228

Lagrangian averaging plays an important role in the analysis of wave–mean-flow interactions and other multiscale fluid phenomena. The numerical computation of Lagrangian means, e.g. from simulation data, is, however, challenging. Typical implementati... Read More about Computing Lagrangian means.

Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence (2023)
Journal Article
Cox, M. R., Kafiabad, H. A., & Vanneste, J. (2023). Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence. Journal of Fluid Mechanics, 958, Article A21. https://doi.org/10.1017/jfm.2023.83

The scattering of three-dimensional inertia-gravity waves by a turbulent geostrophic flow leads to the redistribution of their action through what is approximately a diffusion process in wavevector space. The corresponding diffusivity tensor was obta... Read More about Inertia-gravity-wave diffusion by geostrophic turbulence: the impact of flow time dependence.

Inertia-gravity-wave scattering by three-dimensional geostrophic turbulence (2021)
Journal Article
Savva, M. A. C., Kafiabad, H. A., & Vanneste, J. (2021). Inertia-gravity-wave scattering by three-dimensional geostrophic turbulence. Journal of Fluid Mechanics, 916, Article A6. https://doi.org/10.1017/jfm.2021.205

In rotating stratified flows including in the atmosphere and ocean, inertia-gravity waves (IGWs) often coexist with geostrophically balanced turbulent flows. Advection and refraction by such flows lead to wave scattering, redistributing IGW energy in... Read More about Inertia-gravity-wave scattering by three-dimensional geostrophic turbulence.

Wave-averaged balance: a simple example (2021)
Journal Article
Kafiabad, H. A., Vanneste, J., & Young, W. R. (2021). Wave-averaged balance: a simple example. Journal of Fluid Mechanics, 911, Article R1. https://doi.org/10.1017/jfm.2020.1032

In the presence of inertia-gravity waves, the geostrophic and hydrostatic balance that characterises the slow dynamics of rapidly rotating, strongly stratified flows holds in a time-averaged sense and applies to the Lagrangian-mean velocity and buoya... Read More about Wave-averaged balance: a simple example.