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Here, the edges of the geometry will be given names so one can assign boundary conditions in Fluent in later steps. The left side of the pipe will be called "Inlet" and the right side will be called "Outlet". The bottom side will be called "CenterLine" and the other edges are called "Wall", as shown in the image below. 

In order to create a named selections first Click Edge Selection Filter, . Then click on the left side of the rectangle and it should highlight green. Next, right click the left side of the rectangle and choose Create Named Selection as shown below. 

Select the left edge and right click and select Create Named Selection. Enter Inlet and click OK, as shown below. 

Now, create named selections for the remaining edges and name them according to the diagram. Since the "Centerline" consists of two edges thus when naming the centerline you should use "Ctrl" to select both parts. For the "Wall", use "Ctrl" to select three edges.

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