The input files are "well3d_t.in" and "well3d_r.in", respectively. The according superfiles are "hbgc123d.w_t" and "hbgc123d.w_r". The binary input file containing the flow field is "well3d.flow". (This binary file is system-dependent and included in the distribution.)
This example shows the utilization of a flow field that was calculated with an external flow code. 3DFEMWATER was used in this case (example 3 from Yeh, 1987). The binary input file contains the steady-state velocity field and the moisture content data. The problem involves the steady-state flow to a pumping well. The region of interest is bounded on the left and right by hydraulically connected rivers; on the front, back, and bottom by impervious aquifuges; and on the top by an air-soil interface. A pumping well is located at (x, y) = (540 dm, 400 dm). The water table in the rivers is held at 60 dm. To simulate the pumping, the water level in the well is held at 30 dm. The porosity of the medium is 0.25.
Because of the symmetry, the region for the flow field simulation was taken as 0 < x < 1000 dm, 0 < y < 400 dm, and 0 < z < 72 dm. This region was discretized with 20 x 8 x 10 = 1600 elements resulting in 21 x 9 x 11 = 2079 node points.
There are two variants: The input file "well3d_t.in" simulates transport of a non-reactive tracer. The input file "well3d_r.in" uses the same setup of reactions as sample 5 ("Microbiological and chemical reactions coupled with transport").
Reference
Yeh, G. T. (1987): 3DFEMWATER: A three-dimensional Finite Element Model of WATER flow through saturated-unsaturated media. Oak Ridge National Laboratory, Environmental Sciences Division, Publication No. 2904. Report No. ORNL- 6386.