Théorique, numérique
The collective behavior of fish is an astonishing example of coordinated movement that forms spontaneously on a large scale despite limited communication between individuals. In situ studies have identified the benefit of such schooling behavior: energy saving for swimming, visual effect for fighting a predator. Recently, experimental studies have also made it possible to test interaction models between individuals in a simple environment. Some phases of collective movements have been characterized by different dynamic models of non-equilibrium systems. We have recently proposed a model, purely orientational, which shows the gain in rheotaxis performance in the presence of collective interactions. For this internship, we propose a numerical work. The objective of the internship is to study the dynamics of groups of fish in 3D. A preliminary work has already been carried out and shows the emergence of new phases that appear and do not exist in 2D (i.e. the majority of models published in the literature) like elongated milling structures or turning phases that appear because of the third dimension. A phenomenon that has to be understood!