HydroGeoSphere/Axisymmetric Flow

Axisymmetric coordinates
This instruction is used for simulating radial flow to a well. It should only be applied to a vertical cross-section, of unit thickness in the y-direction. The x-coordinate is taken as the radial distance.

One should define a vertical cross-section of unit thickness in the y-direction (with 2 nodes in that direction), and locate a pumping/injection well at the origin (x = 0.0).
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