Rex Britter

TL;DR: In this paper, the mixing of passive scalars that arises from shear-free decaying grid-generated turbulence is examined, where flow configuration consists of two homogeneous layers of equal density separated by a sharp interface between different mean concentrations of passive scales.

TL;DR: In this paper, an experimental study of shear-free decaying grid-generated turbulence on both sides of a sharp interface between two homogeneous layers of different densities is presented, and the evolution of turbulence and mixing are examined by simultaneously mapping the velocity (u, w) and density fields @) and the vertical mass flux F(= pW/p'w') together with flow visualization in a low-noise water tunnel.

TL;DR: In this paper, the authors attempt to provide a theoretical framework for the formulation of mathematical models of dense gas dispersion in the atmosphere by dividing the evolution of a released dense gas cloud into four phases, during each of which different physical processes governing the behaviour of the cloud are most important.

TL;DR: In this paper, the authors reviewed some fundamental drivers of UFP emissions and dispersion, and highlighted unresolved challenges, as well as recommendations to ensure sustainable urban development whilst minimising any possible adverse health impacts.

TL;DR: In this paper, computational fluid dynamics simulations are performed on urban street canyons with six different aspect ratios, focusing on the special case where the leeward wall is at a greater temperature than local ambient air.