The motion of a pair of micro-wedges ("carriers") in a turbulent bacterial bath is explored using computer simulations with explicit modeling of the bacteria and experiments. The orientation of the two micro-wedges is parallel and fixed by an applied magnetic field but the translational coordinates can move freely as induced by the bacterial bath. As a result, two carriers of same orientation move such that their mutual distance decreases. Eventually the two carriers stack on each other with no intervening bacteria exhibiting a stable dynamical mode where the two micro-wedges follow each other with the same velocity. These findings are in qualitative agreement with experiments on two micro-wedges in a bacterial bath. Our results provide insight into understanding the self-assembly of many micro-wedges in an active bath.
@article{arxiv.1411.0964,
title = {Motion of two micro-wedges in a turbulent bacterial bath},
author = {Andreas Kaiser and Andrey Sokolov and Igor S. Aranson and Hartmut Löwen},
journal= {arXiv preprint arXiv:1411.0964},
year = {2015}
}