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Here we are interested in creating a grid style of mesh that can be mapped to a rectangular domain. This meshing style is called Mapped Face Meshing. In order to incorporate this meshing style (Click) Mesh Control > Mapped Face Meshing as can be seen below. 
../../../../../../../../../../download/attachments/85624045/MenuMappedFaceMeshing_Full.png

Now, the Mapped Face Meshing still must be applied to the pipe geometry. In order to do so, first click on the pipe body which should then highlight green. Next, (Click) Apply in the Details of Mapped Face Meshing table, as shown below. 
../../../../../../../../../../download/attachments/85624045/SelectApply_Full.png

After clicking Apply, you should see "Geometry: 1Face". Now, (Click) Mesh > Generate Mesh as can be seen below, and generate a rough mesh.

../../../../../../../../../../download/attachments/85624045/MenuGenMesh_Full.png

Edge Sizing

The desired mesh has specific number of divisions along the radial and the axial direction. In order to obtain the specified number of divisions Edge Sizing must be used. The divisions along the axial direction will be specified first. Now, an Edge Sizing needs to be inserted. First, (Click) Mesh Control > Sizing as shown below. 
Now, the geometry and the number of divisions need to be specified. First (Click) Edge Selection Filter, , in the upper toolbar. Hold down the "Ctrl" button and then click the edges AF and BG. Both sides should highlight green. Next, hit Apply under the Details of Sizing table as shown below. 

../../../../../../../../../../download/attachments/85624045/DetSizing_Full.png

Now, change Type to Number of Divisions as shown in the image below. 
../../../../../../../../../../download/attachments/85624045/NumbDiv_Full.png

Then, set Number of Divisions to 100 as shown below.  Image Removed
../../../../../../../../../../download/attachments/85624045/SetTo100_Full.png

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Change Behavior to Hard for both Edge Sizing's. Image Removed
../../../../../../../../../../download/attachments/85624045/BehaviorHard_Full.png

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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. 

Detail around the expansion entrance FG is presented blow.

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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