3rd International E-Conference on Engineering, Technology and Management - ICETM 2020
Author(s) : Domingos Xavier Viegas, EusÃ©bio ConceiÃ§Ã£o, JoÃ£o Gomes, Jorge Raposo, Maria Manuela LÃºcio, Maria Teresa Viegas
In this work the geometry of a virtual pine tree was developed. This geometry, applying mesh generation, is used to evaluate the view factors, used to calculate the heat exchanges by radiation, between the virtual pine tree and a fire front. The virtual pine tree geometry, developed using a three-dimensional tree model, has a height of 7.5 m and is constituted by 8863 cylindrical elements. The virtual pine tree geometry is built by trunks, branches and leaves. The fire front has 10 m long and 1 m high. The distance between the virtual pine tree geometry and the fire front is 5 m. The virtual pine tree geometry is divided in four levels. Each level is built with 8 radial trunks, 24 branches and 2160 radial leaves. Between each level a vertical trunk is considered. In the top of the last level a vertical branch with 90 radial leaves is considered. The numerical results of the geometry, mesh generation and the view factors are represented and calculated. The view factors between the virtual pine tree geometry and the fire front, that each trunk, branches and leaves are subjected, are highest in the side of the fire front and decrease from the first level to the last level.