Floating substances such as plastic waste discharged into the ocean and pollutants such as PM2.5 discharged into the atmosphere are carried by turbulent flows, but they depend on the size and density (inertia magnitude) of the particles and do not completely follow the flows. In recent years, large-scale numerical simulations using supercomputers have shown that particles in turbulent flow partially concentrate on a scale that depends on the magnitude of inertia, and diffuse. It is obvious that the most effective way is to prevent the discharge of garbage and pollutants, but it would be great if we could propose a method for efficiently recovering what has been discharged once in flows.