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In the details window, select Geometry > Apply. Now the mesher knows which edges to apply the sizing to. Ensure that Type is set to Element Size, then change the Size from Default to 0.05 m as shown below. This will set each division size on the corresponding edges to 0.05 m. (If we want a finer mesh, we would input a smaller Sizesize.)

Now, we will create an edge sizing for the vertical edges of the geometry. Create another edge sizing, and this time, choose the left and right vertical edges of the geometry by holding down the Ctrl key and selecting each of them, and go to Geometry > Apply. Change the Type to Number of Divisions. Next, specify Number of Divisions to 30. Note that one can specify the Element Size or Number of Divisions depending on which is more convenient.

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The generated mesh should now be seen. (If you don't see it at first, select in the tree outline to show the generated Meshmesh). You can zoom in/out using the middle mouse wheel. We see that ANSYS decreases the mesh size near the entrance since it sees a corner. This is fine for our case since this will better resolve the rapidly developing boundary layer near the entrance. So we won't override this.

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