An Occlusion Algorithm for Complex Cavities of Aircraft and Engine

According to the high-frequency electromagnetic field approximation theory,it is necessary to consider faradic mutual interaction of the inner surface cells in the duct.That is to evaluate mutual occlusion of the cells by RCS calculation of the inlet,nozzle and cockpit in the aircraft.In this paper,on the basis of comparing direct search and improved algorithm,parallel+direct search algorithm and topological algorithm,a new algorithm-topology trace algorithm is proposed,which can quickly judge the mutual visibility of surface grid cells on the complex cavities.Computational analysis shows that the algorithm presented in this paper is not only applicable to evaluating occlusion of any complex cavities,but also has the compution speed faster than the other three algorithms by several times.Furthermore,the bigger the volume meshes are,the faster the computation speed is.