Hi Georg, the dimension should be taken from the grid. If you want to use the Stokes discretized with the box method, it is not guaranteed to converge, as as it uses assumptions which only holds for 2d.
Bye Christoph -- A mathematician is a scientist who can figure out anything, except such simple things as squaring the circle and trisecting an angle. [Evan Esar (1899-1995), Esar's Comic Dictionary]
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