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Since we are going to manually specify meshing type and element size, we should turn off ANSYS build-in advanced sizing function. Under Details of "Mesh", expand Sizing, select Off next to Use Advanced Size Function.

https://confluence.cornell.edu/download/attachments/111221571/turn+off+advanced+size.gif

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We would also like to create a structured mesh where the opposite edges correspond with each other. Let's insert a Mapped Face mesh.  Under Outline, right click on Mesh, move cursor to Insert, and select Mapped Face Meshing. Alternatively, you can click on Mesh Control on the third menu and select Mapped Face Meshing. Finally select the pipe surface body in the Graphics window and click Apply next to Geometry.

https://confluence.cornell.edu/download/attachments/111221571/Mapped+Face.gif

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Now let us move on to specify the element sizing along the pipe radial direction.
Outline > Mesh > Insert > Sizing
In the Graphics window, select both the left and right edge of the geometry (click on the Edge tab on the Fluid flow (Fluent) - Mesh window and then press Ctrl + mouse click to multiple select). Under Details of "Edge Sizing", click Apply next to Geometry. Change the edge sizing definition Type to Number of Divisions. Enter 30 for Number of Divisions.

https://confluence.cornell.edu/download/attachments/111221571/Radial+Sizing.gif

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Outline > Mesh > Insert > Sizing
In the Graphics window, select all the top and bottom edge of the geometry (press Ctrl + mouse click to multiple select). Under Details of "Edge Sizing", click Apply next to Geometry. Enter 0.03 for Element Size (this will give us roughly 200 divisions). Next to Behaviour, change Soft to Hard (This is to overwrite the sizing function employed by ANSYS Mesher. Try meshing with soft behavior and see what you get).

https://confluence.cornell.edu/download/attachments/111221571/Axial+Sizing.gif

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Select the left edge and right click and select Create Named Selection. Enter Inlet and click OK. Under Outline, you will see the name Inlet under Named Selections.

https://confluence.cornell.edu/download/attachments/111221571/Named+Selection.gif

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