Unlike separation from a solid body, the instream recirculation regions in laminar incompressible flows with a single vorticity component are associated with two different types of stagnation region. They can be distinguished by the null vorticity contour and the angle of streamline saddlepoint intersection. Examples are drawn from the two-dimensional and axisymmetric literature over a wide range of Reynolds numbers.
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V. O’Brien (1984) studied this question.
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