CFD (Computational Fluid Dynamics) simulations are widely used nowadays to predict the behaviour of fluids in pure research\nand in industrial applications. This approach makes it possible to get quantitatively meaningful results, often in good agreement\nwith the experimental ones. The aim of this paper is to show how CFD calculations can help to understand the time evolution\nof two possible CBRNe (Chemical-Biological-Radiological-Nuclear-explosive) events: (1) hazardous dust mobilization due to the\ninteraction between a jet of air and a metallic powder in case of a LOVA (Loss Of Vacuum Accidents) that is one of the possible\naccidents that can occur in experimental nuclear fusion plants; (2) toxic gas release in atmosphere. The scenario analysed in the\npaper has consequences similar to those expected in case of a release of dangerous substances (chemical or radioactive) in enclosed\nor open environment during nonconventional events (like accidents or man-made or natural disasters).
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