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The plot below shows the profile of the axial velocity along the centerline (y = 0 m) with the refined mesh. It can be seen that the max velocity in the small pipe is about 5.50e-1 m/s, which is close to the analytical solution (5.54e-1 m/s) and better than that of the previous mesh.

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Here we will create a straight line for the expansion entrance, which is from (x0, y0) = (0, 0) to (x1, y1) = (0, 1). Select Line under Surface. Enter x0 = 0, y0 = 0, x1 = 0, y1 = 1. Enter expansion under New Surface Name. Click Create. 

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Then, plot the velocity profile along the expansion line. In the Solution XY Plot menu make sure that Position on X Axis is selected, and X is set to 0 and Y is set to 1.

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