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for the given nozzle geometry, we get

r( x ) = \[(0.1 + x{^}2^)/pi\]^0.5^; \-0.5 < x < 0.5

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Then, check the Vertices and Edges boxes under Geometry to Create as we want to create the vertices as well as the curved edge. Image Removed Image Added
 Click Accept.
This should create the curved edge. Here it is in relation to the vertices we created above: Image Added
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 (Click picture for larger image)

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Similarly, create the vertical edge for the outlet. Image Removed Image Added
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