Two regimes of dilute turbulent settling suspensions under shear

Jake Langham*, Andrew J Hogg

*Corresponding author for this work

Research output: Contribution to journalLetter (Academic Journal)peer-review


When turbulent flow is laden with negatively buoyant particles, their mean distribution in the direction ofgravity can induce stable density gradients that penalize turbulent fluctuations. This effect is studied numericallyfor shear-driven flow with dilute non-inertial sediment. The turbulent dynamics and sediment transport dependcritically on particle settling velocity 𝑣𝑠, splitting into two regimes: homogeneous weakly stratified turbulenceand flow with developed turbulence atop an intermittent boundary layer. At intermediate 𝑣𝑠, neither state can besustained and the flow laminarizes.
Original languageEnglish
Article numberL062602
JournalPhysical Review Fluids
Issue number6
Publication statusPublished - 10 Jun 2024

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© 2024 authors. Published by the American Physical Society.


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