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When turbulent flow is laden with negatively buoyant particles, their meandistribution over the direction of gravity can induce stable density gradientsthat penalize turbulent fluctuations. This effect is studied numerically forshear-driven flow with dilute non-inertial sediment. The turbulent dynamics andsediment transport depend critically on particle settling velocity $v_s$,splitting into two regimes: homogeneous weakly stratified turbulence and flowwith developed turbulence atop an intermittent boundary layer. At intermediate$v_s$, neither state can be sustained and the flow laminarizes.

Two regimes of dilute turbulent settling suspensions under shear