Abstract
We sought for the simple relations which exist between the two-dimensional flow of a viscous fluid past a cylindrical obstacle and the flow past the same obstacle rotated by an angle π about its axis, within the accuracy of Oseen's approximation. It is shown that the forces acting upon the cylinder do not change by the rotation of the cylinder, as far as the terms of order O ( R -1 ) are concerned. Further, for the special cases of symmetrical obstacles which experience no lift, it is shown that the total drags for the original and the rotated bodies coincide with each other within the accuracy of O ( R ).
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