The Gandhi's scaled-frequency FDTD (finite-difference time domain) method for the computation of electromagnetic fields of low frequency is modified, which is adaptable to the numerical computation of soft-contact mould. The computational results for the simplified model agree well with the analytical solutions.

Four basic types of integration of radiative exchange area are generalized using general symmetry and applied to ten kinds of computation.The kinds of partial blocks of the matrix of radiative direct exchange area are analyzed,and the whole matrix is classified into four types of partial areas.Utilizing general symmetry,the quantitative expressions for the computation reduction of the direct exchange area of both three dimensional and two dimensional systems are presented.