Model and simulation:two-dimensional model FF),F)=。+方++人+f面 f(P()=4(P+P)+Au(P+P:)+APP +Am(p+p)Au(P:+P) Aj(r)=Ao(T-T+bm(r)C(r)+>Rs(r+R) s(r+R)=br(r+R)-C(r+R)-R-a Co,Cp by T,To a Model and simulation: two-dimensional model P u F[P(r), u (r)] f f f f f  dr p g u c E              A ( P P ) A ( P P P P ), f ( P ( r )) A ( P P ) A ( P P ) A P P 2 x 4 y 2 y 4 112 x 6 y 6 111 x 2 y 2 12 x 4 y 4 11 x 2 y 2 p 1 x            A 1 (r)=A 0(T-T0)+b m (r)·C(r) + ∑R{s(r+R)} s(r+R)= b m(r+R)·C(r+R)·R-a C 0 ,Cp, b M, T, T0, a r