Computational fluid dynamics (CFD) provides the mathematical and computational tools for the numerical simulations of fluid flows, an essential component in a number of applications ranging from geophysics to industrial applications. It can be used to forecast the areas subject to potential inundation by natural flows (tsunamis, lava flows, landslides, pyroclastic flows), to evaluate the impact and cost of strategies aimed at reducing long- and short-term risk from natural and man-made hazards, or to test mechanical designs and verify their efficiency before the costly implementation...