Animation of a simulated turbulent flow

This is an animation of a numerical simulation, where a passive tracer is transported by the flow inside a cuboid domain with free outflow boundary conditions (except for the inlet boundary, which is a "solid wall" with a laminar jet flowing out of it). Turbulent dynamics develop spontaneously from a laminar initial condition. The inlet boundary condition is laminar and constant in time. Arrows display the velocity of the flow, while the tracer is shown as a black "smoke". For viewing convenience, the first video does not display the velocity field (so that the simulation looks like an experiment).