简介:Thenumericalmethodsformiscibledisplacmentinaggregatedorsorbingmediumareconsidered.Amixedfiniteelementmethodisadoptedforthepressureequation.Theconcentra-tioninthemobilewaterisapproximatedbyacombinationofaGalerkinfiniteelementmethodandthemethodofcharacteristicsandtheconcentrationinimmobilewaterisapproximatedbyastan-dardGalerkinmethod.Themovingmeshtechniquewhichdependsontimetisadoptedhere.Themovingmeshescanvaryindifferentspacialdomainswithdifferentvariabletimes.OptimaerrorestimatesinenergynormandL2normareobtainedundercertainconstraints.