Modelling of the deposition of retardant in a tree crown during fire fighting

In this work we propose an approach for estimating the deposition of retardant in vegetation during fire fighting by aerial dropping. Firstly we define the geometrical structure of a tree using fractal interpolation. Once this structure has been defined a mesh is constructed and the flow of retardant is then computed using a simple V.O.F. model. Estimation of the quantity of retained liquid is calculated with a so called ‘‘dripping model’’. The results of the two approaches are compared and it is shown that they provide coherent results.