Study finds wind concentrates pollutants with unexpected order in an urban environment
Study finds wind concentrates pollutants with unexpected order in an urban environment 26 August 2012 Cities—with their canyons, isolated greenery, and congested traffic—create seemingly chaotic and often powerful wind patterns known as urban flows. A new study has found that pollutant particles carried by these flows prefer to accumulate in specific regions of the urban environment and even form coherent structures, rather than scattering randomly. The paper by researchers from Arizona State University and Notre Dame is published in the American Institute of Physics (AIP) journal Physics of Fluids . The unexpected finding is coherent patterns in fluid flows were thought to have no real analog in nature. In previous studies, the existence of these patterns in fluid flows was only verified with idealized “theoretical” flows. It was not known if such structures were robust e...