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Comment: Soft to Hard Behavior

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Let's specify the number of divisions to be used along each edge rather than have ANSYS pick them automatically. ANSYS calls this step "edge sizing". We will use 20 divisions along the vertical edges and 10 divisions along the horizontal edges. We will work with the horizontal edge first. In order to implement the edge sizing, first (Click) Mesh, . Next, (Click) Mesh Control > Sizing, as shown below.


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https://confluence.cornell.edu/download/attachments/146918513/InsSizing_Full.png


Next, click on the edge selection filter, , located at the top of the GUI. Then click on the bottom edge of the rectangle, ctrl-click on the top of the rectangle (to select both of them), and (Click) Apply in the "Details of Sizing" table as shown below.


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https://confluence.cornell.edu/download/attachments/146918513/DetSizing_Full.png


Next, set Type to Number of Divisions and set Number of Divisions to 10, as shown below.


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https://confluence.cornell.edu/download/attachments/146918513/detdet_full.png
You will notice that under Number of Divisions there is a row labeled Behavior which is defaulted to Soft.  Change this option to Hard.  Soft Behavior means that the mesher will take your sizing just as a guideline, not an absolute law.  For our simple geometry, we know exactly what the mesh should look like, and don't wan the mesher taking any creative interpretations of our sizing options.

 
This completes the sizing for the horizontal edge. Now, create a new edge sizing, apply it to the right and left vertical edges  (ctrl-click to keep both of them selected.) And set the Number of Divisions to 20. After, you have properly implemented the two edge sizing commands, (Click) Update, , in order to generate the new mesh. You should then obtain the following mesh. Important note: If ANSYS modifies the number of divisions you give it, change the setting for Behavior in the above menu from Soft to Hard.


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