Sign-up for free online course on ANSYS simulations!...
In order to create the desired geometry we will first create a surface body for the cylinder. Next, we will create a surface body for the outer boundary as a "frozen body", so that it doesn't merge with the first surface body. Then, we will use a boolean operation to subtract the small surface body from the large surface body. At this point, we will have the surface body of the outer boundary with a hole in the middle where the cylinder is. Lastly, we will project a vertical line on to the geometry, so that radial edge sizing can be implemented in the meshing process.
...
Concept > Surfaces From Sketches.
Set the Base Object to Sketch 1 (located underneath XYPlane in the Tree). You can do this by clicking within the tree or you can click on the circle to select Sketch 1. Then click Apply next to Base Object.
Click Generate
Create New Sketch in the XY Plane
In this step we will create a new sketch in the XY Plane. This step is required for the boolean operation that we will carry out later in the geometry process. It allows us to create two distinguishable geometries, in the xy plane.
Click on XYPlane in the Tree Outline and it should highlight blue. Then click on the New Sketch button, 
.
Create Outer Circle and Dimension
Now, create a circle centered around the origin in Sketch 2. Set the diameter of the circle to 64m. You can click the "fit to window" button shown below to see both circles.
Outer Circle Surface Body Creation
...
Concept > Surfaces From Sketches.
Set the Base Object to Sketch 2 (located underneath XYPlane in the Tree). You can do this by clicking within the tree or you can click on the outer circle to select Sketch 2. Then click Apply next to Base Object.
Then set Operation to Add Frozen as shown in the image below.
\
Then, click Generate
Carry Out Boolean Operation: Subtraction
...
Create > Boolean.
First, set Operation to Subtract. Next, use the face selection filter, 
, to apply the outer circle surface body as the Target Body. Then, use the face selection filter, , to apply the inner circle surface body as the Tool Body. In order to select inner circle which overlaps with the outer circle, you may have to click on the planes to the lower left as shown below.
Lastly, click Generate. At this point if you zoom into the center of the circle you should see the 1m diameter hole, as shown below.
...