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physics.flu-dyn2025
The Lagrangian kinetic energy cascade in Rayleigh-Bénard convection
Robin Barta, Claus Wagner, Ron Shnapp
Rayleigh-Bénard convection at high Rayleigh number exhibits turbulence superimposed on large-scale circulation. While buoyancy forces drive the flow at certain scales, how kinetic…
physics.flu-dyn2025
Velocity alignment explains Lagrangian irreversibility in turbulence
Ron Shnapp
Lagrangian particles in turbulence separate away from each other faster in the backward in time direction as compared to forward in time. In this work, we show that time irreversib…