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Sensitivity analysis with an ellipse with major and minor axis being 0.6 and 0.4 at different orientations. (a) The major axes is aligned with the x-direction. (b) The ellipse is rotated forty-five degrees in counter-clock direction. (c) The major axes is aligned with the y-direction. The right plots are the vorticity when 1/μ = 70, 45, 40 respectively.
