ADVECTIVE DIFFUSION ANALYZING METHOD FOR POLLUTANTS

摘要

PROBLEM TO BE SOLVED: To provide an advective diffusion analyzing method for pollutants based on the Euler-Lagrange technique that can restrain numerical dispersion and accomplish precise simulation of groundwater pollution.SOLUTION: Analysis of the advective term in a fundamental equation based on the Euler-Lagrange technique is accomplished at a prescribed timing for each reference element, and the concentrations of pollutants at each node is updated according to the concentration at a virtual node at the advective source. The prescribed timing of analyzing the advective term for each reference element is such that the extent of shifting from a virtual node A2 at the advective source to a node A0 of the reference element E0 one or more prescribed time steps later corresponds to the approximate element width of the mesh-divided reference element in at least one of the x direction, the y direction and the z direction.