Screening in two-dimensional foams

TL;DR

This paper uses numerical simulations to analyze how localized deformations in two-dimensional foams are screened, revealing exponential decay of pressure changes over a few bubble diameters.

Contribution

It provides a detailed numerical study of deformation screening in 2D foams, considering various perturbation types and bubble conservation scenarios.

Findings

Pressure changes decay exponentially with distance from perturbation.

Screening length is a few bubble diameters.

Deformation response varies with perturbation type.

Abstract

Using the Surface Evolver software, we perform numerical simulations of point-like deformations in a two-dimensional foam. We study perturbations which are infinitesimal or finite, isotropic or anisotropic, and we either conserve or do not conserve the number of bubbles. We measure the displacement fields around the perturbation. Changes in pressure decrease exponentially with the distance to perturbation, indicating a screening over a few bubble diameters.