An accurate equivalent model for field iterative method

In this paper, the authors have found an equivalent model to set up accurate. formulae of the field iterative method (FIM) for interior scattering from cavity structures. The newly established FIM call be used to analyze scattering front various cavities with good convergence behaviour and accuracy. Numerical simulations for various cavity benchmarks, such as offset bend cavity, s-shaped cavity, double s-shaped cavity, annular cavity. and aerodynamic cavity structure, etc. have verified the accuracy and robustness of present formulation of the FIM.