混合拉普拉斯变换有限单元法计算二维地下水溶质运移问题

The application of hybrid Laplace transform finite element method to solve two dimensional ground water solute transport problem

在求解对流占优的地下水溶质运移问题时，常规数值方法会产生数值扩散和过量现象．本文将混合拉普拉斯变换有限单元法引入求解二维对流扩散问题，结果表明，这种新的计算方法能有效地消除数值扩散和过量现象，同时由于具有一步到位、局部求解的优点。

In this paper, the hybrid Laplace transform finite element method proposed by Chen H.T.et al in the field of heat transfer is expanded to solve two dimensional convection and dispersion problems. The computational results show that this new method can overcome the artificial diffusion and overshoot effectively. Since no time step is used, the present method can calculate the specific node concentration at any specific time. The new algorithm is suitable for predicting the long term contamination of ground water in large field domain.