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Numerical solution has been obtained of the equations of motion of a viscous incompressible fluid in a curved
annular conduit with circular cross-section. These equations are approximated by finite-difference equations which are of
the second-order accuracy with respect to the grid sizes. The computed results are presented for the range 96 ≤ D ≤ 8000 ,
where D is the Dean number of the flow and for various sizes of core radii, the limiting cases of a very large and a very
small core being also studied. It is shown that in the case of a small core radius, the variation of the Dean number affects
significantly the flow properties, situation which is not observed when the core radius is large.