Fluid flow towards or away from fluid source/drain (usually a well) which is aligned along the radial direction in 2D space with axial symmetric.
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| Fig. 1. Radial flow schematic around a producing well in a vertically homogeneous reservoir | Fig. 2. A sample of radial flow aligned along radial direction and in this case defined by a vector field u({\bf r}) = u(r), where r=\sqrt{x^2+y^2} |
