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Let's repeat the solution on a finer mesh. For the finer mesh, the numbers of radial divisions will be twice as many as those used before. In the Workbench Project Page right click on Mesh then click Duplicate as shown below. 

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Rename the duplicate project to suddenExpansion (mesh2). You should have the following two projects in your Workbench Project Page. 

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Next, double click on the Mesh cell of the suddenExpansion (mesh2) project. A new ANSYS Mesher window will open. Under Outline, expand Mesh and click on Edge Sizing, as shown below. 

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Here we will increase the numbers of cells in the radial direction. You may have different names of sizings. In my case, the "Edge Sizing" corresponds to the AB and EF edges, and "Edge Sizing 4" corresponds to the CD edge. Double the Number of Divisions of "Edge Sizing"

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and "Edge Sizing 4"

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Sometimes, you need to turn-off "Advanced Size Function" under "Details of Mesh" to get the mesher to accept the modified settings. That way the Advanced Size Function feature will not over-ride your settings (this feature is useful for meshing complex geometries). Click Mesh in the tree and turn off Advanced Size Function under "Details of Mesh" as shown below. 

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