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Follow the same procedure as for the edge sizing on the other edges. Make sure to (Click) Mesh Control > Sizing every time. Then, generate the mesh by clicking Mesh > Generate Mesh. You should obtain the following mesh. 

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Detail around the expansion entrance FG is presented blow.

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Mesh statistics can be found by clicking on Mesh in the tree and then by expanding Statistics under the Details of Mesh table. It can be seen that there are 22000 elements in the mesh above.

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

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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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