Abstract: van Leer's splitting scheme is used to solve the Euler equations to obtain the aerodynamic characteristics. The vector flux splitting scheme is used to calculate the time domain electromagnetic scattered characteristics. Radar cross section (RCS) is then evaluated with the equivalence principle and Fast Fourier Transformation. Two obtained solutions are coupled with a simple effective numerical optimization algorithm to obtain high aerodynamic efficiency and low observability of the airfoil. Numerical results show that the present method is an effective and robust tool for designing or revising airfoils, as well as for multi disciplinary optimization.

Key words: numerical optimization, Euler equat ions of mot ion, Maxwell equation, multi- disciplinary optimization