孤立波数值方法综述(Ⅱ)

III Finite Element Methods We take element, I=sum from j=1 to N (I_j). Let Φ_h and Ψ_h be the trail function space and test function space respectively with basis (x) and (x). We suppose U~h(x,t)=sum from j=1 to N (U_i(t)(?)_j(x)), x∈I,t≥0. The usual Galerkin method is to find U~h∈L~∞(0,T;Φ_h) satisfying (21) In order to improve the stability and convergence, the dissipative finite element