Screening in dry two-dimensional foams

Abstract

We perform numerical simulations of point-like deformations in a dry two-dimensional foam using the Surface Evolver software. 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 the perturbation, indicating a screening over a few bubble diameters.