非定常-飽和・不飽和浸透流に対する有限要素解析の解

Abstract

A solution obtained by applying finite element analysis to a non-steady saturated unsaturated seepage flow in ground, often disagrees with other ones obtained under other calculating condition, namely the time interval, the mesh size and the allowable error of convergency at each time step. The trouble is that it has not been so far known the way of finding out the most exact solution among these different ones through finite element analyses. In this paper, for the purpose of making such trouble clear, relationships between exact solution and such factors as time step interval, mesh size and allowable error are discussed. Furthermore, the procedure for obtaining the most exact solution is proposed.