PAME tools for RCS prediction and NCTI applications: Methodology and prediction for the French channel model

Abstract

This paper is based on research conducted by ONERA the French Aerospace Lab) for efficiently calculate the RCS of an air intake of an aircraft. The multidomain and multi-method (MD2M) coupling scheme, called FACTOPO [1], is based on generalized scattering matrix computation on three-dimensional subdomains. The global target is split in NV subdomains (Vi) separed by NI fictitious surfaces Γj (Figure 1. ). We use a modal representation of the tangent fields on the interfaces. In each domain, the generalized Scattering matrix Si is computed independently of the others using the most appropriate method (MLFMM, direct solver taking into account symmetries [2], asymptotic method …). This coupling scheme leads to an important reduction in computational resources. The advantages of this formulation for parametric studies will be illustrated by the computing of the RCS of an air-intake with turning engine.