本文在文献[1]的基础上,以分裂后的Lagrange形式下的对流算子和Euler形式下的扩散算子为模型,分别采用连续特征线法和有限分析法,数值模拟了污染过程中的对流扩散运动。数值试验表明,耦合后的数值模型能较好地抑制大P.数下的数值耗散和伪振荡现象,计算过程简单易行,数值解具有局部解析解的性质和精度。 Based on the literature [1], this paper takes the convectional operator under the split Lagrange form and the diffusion operator under the Euler form as the models, and adopts the continuous characteristic method and the finite analysis method respectively to numerically simulate the process of pollution Convection spread movement. Numerical experiments show that the coupled numerical model can suppress the numerical dissipation and pseudo-oscillation under large P-number well. The calculation process is simple and easy. The numerical solution has the property and precision of local analytical solution.