Screening, Hyperuniformity, and Instability in the Sedimentation of Irregular Objects

Tomer Goldfriend, Haim Diamant, Thomas A. Witten

Research output: Contribution to journalArticlepeer-review


We study the overdamped sedimentation of non-Brownian objects of irregular shape using fluctuating hydrodynamics. The anisotropic response of the objects to flow, caused by their tendency to align with gravity, directly suppresses concentration and velocity fluctuations. This allows the suspension to avoid the anomalous fluctuations predicted for suspensions of symmetric spheroids. The suppression of concentration fluctuations leads to a correlated, hyperuniform structure. For certain object shapes, the anisotropic response may act in the opposite direction, destabilizing uniform sedimentation.

Original languageEnglish
Article number158005
JournalPhysical Review Letters
Issue number15
StatePublished - 14 Apr 2017
Externally publishedYes


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