Mediated interactions between rigid inclusions in two-dimensional elastic or fluid films

Abstract

Interactions between rigid inclusions in continuous three-dimensional linearly elastic solids and low-Reynolds-number viscous fluids have largely been quantified during the past. Prime example systems are given by functionalized elastic composite materials or fluid colloidal suspensions. Here, we address the significantly less frequently studied situation of rigid inclusions in two-dimensional elastic or low-Reynolds-number fluid films. We concentrate on the situation in which disk-like inclusions remain well separated from each other and do not get into contact. Specifically, we demonstrate and explain that the logarithmic divergence of the associated Green's function is removed in the absence of net external forces on the inclusions, in line with physical intuition. For instance, this situation applies when only pairwise mutual interactions between the inclusions prevail. Our results will support, for example, investigations on membranes functionalized by appropriate inclusions, both of technical or biological origin, or the dynamics of active microswimmers in appropriately prepared thin films.

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Cited by in corpus (5)

• The role of boundaries for displacements and motion in two-dimensional fluid or elastic films and membranes
• Internal sites of actuation and activation in thin elastic films and membranes of finite thickness
• Rotational dynamics of a disk in a thin film of weakly nematic fluid subject to linear friction
• Hydrodynamics of a disk in a thin film of weakly nematic fluid subject to linear friction
• Topological phase locking in stochastic oscillators