Clouds of monodisperse and polydisperse particles settling under gravity in a quiescent fluid
are analysed in the limit of zero Reynolds number using the Stokeslet model. The
established numerical model is simple and generic, which can be applied to particles of
multiple-size and/or density. However, only the size aspect is dealt with in the present work.
Multiple-size particles slip relative to the ambient fluid at non-uniform velocities. In a swarm
they may be expected to fall differently as compared to those of the same size. In this regard …