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Tom et al.\ (J.\ Fluid Mech.\ 947, A7, 2022) investigated the impact oftwo-way coupling (2WC) on particle settling in turbulence. For the limitedparameter choices explored, it was found that 2WC substantially enhancesparticle settling compared to the one-way coupled (1WC) case, even at low massloading $\Phi_m$. Moreover, contrary to previous claims, it was demonstratedthat preferential sweeping remains the mechanism responsible for the particlessettling faster than the Stokes settling velocity in 2WC flows. However,crucial questions remain: 1) how small must $\Phi_m$ be for the effects of 2WCon particle settling to be negligible? 2) does the preferential sweepingmechanism remain relevant in 2WC flows as $\Phi_m$ is increased? To answerthese, we explore a much broader portion of the parameter space, and oursimulations cover cases where the impact of 2WC on the global fluid statisticsranges from negligible to strong. We find that even for $\Phi_m=7.5\times10^{-3}$, 2WC can noticeably increase the settling for some choices of theStokes and Froude numbers. We also demonstrate that even when $\Phi_m$ is largeenough for the global fluid statistics to be strongly affected by theparticles, preferential sweeping is still the mechanism responsible for theenhanced particle settling. The difference between the 1WC and 2WC cases isthat, in the latter the particles are not merely swept around thedownward-moving side of vortices, but they also drag the fluid with them asthey move down.

Investigating the parametric dependence of the impact of two-way coupling on inertial particle settling in turbulence