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The perturbation of a medium field (a particle wake) determines the Stokesdrag on the particle itself. Besides, it affects the motion of other particles,inducing non-equilibrium correlations between them. We study the inducednon-equilibrium correlations and forces, acting on constituent particles of thebunch or cluster of impurities exposed to a gas stream. Such inducedcorrelations exhibit many striking features that are determined by theproperties of particle bunch collective scattering in a medium. Thecharacteristics of collective scattering are determined by the structure of thebunch itself, that is associated with scattering on inhomogeneities, i.e., onfluctuations of the number of particles (scatterers) in a correlation volume.This is well-known, e.g., in optics and have been shown for gas scattering inour recent work [1]. In particular, a random cluster of impurities experiencesmuch stronger Stokes drag than a regular one. Inhomogeneity of the cluster alsodetermines the presence of giant local fluctuations of the scattered fieldinside a cluster, that was shown for gas stream scattering in [1]. This, inturn, should lead to strong local fluctuations of induced gradient forcesinside the cluster, which can determine its stability. Moreover, thedescription of a cluster in terms of effective parameters (penetration index,effective diffusion coefficient, etc.) brakes down due to the presence of suchfluctuations.

Collective wake-mediated interactions in lattice fluids: Effects of strong local force fluctuations stimulated by impurity disorder