IMPLEMENTATION OF THE CONSTANT DISPLACEMENT SCHEME IN RANDOM-WALK

The constant displacement (CD) scheme has been shown to be fast, compu tationally efficient and accurate for dispersion-free particle trackin g in highly heterogeneous fields. In this paper, the CD scheme is exte nded and applied in the random walk method. Also the previously develo ped Q-BASIC program of particle tracking is extended to be more genera l for modeling contaminant transport in heterogeneous media, including the calculation of snapshots in the CD scheme. The results from an ex ample show that the CD scheme may be fifteen times faster than the tra ditional constant time (CI) scheme for the calculations of contaminant transport in highly heterogeneous media. Copyright (C) 1996 Elsevier Science Ltd