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The viscosity of suspensions of large ($\geq10{\mu m}$) particles diverges athigh solid fractions due to proliferation of frictional particle contacts.Reducing friction, to allow or improve flowability, is usually achieved bytuning the composition, either changing particle sizes and shapes or by addinglubricating molecules. We present numerical simulations that demonstrate acomplementary approach whereby the viscosity divergence is shifted by drivenflow tuning, using superimposed shear oscillations in various configurations tofacilitate a primary flow. The oscillations drive the suspension towards anout-of-equilibrium, absorbing state phase transition, where frictional particlecontacts that dominate the viscosity are reduced in a self-organizing manner.The method can allow otherwise jammed states to flow; even for unjammed states,it can substantially decrease the energy dissipated per unit strain. Thiscreates a practicable route to flow enhancement across a broad range ofsuspensions where compositional tuning is undesirable or problematic.

Shaken and stirred: Random organization reduces viscosity and dissipation in granular suspensions