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In this section the various parts of the geometry will be named according to the image below. First create a named selection for the left half of the outer boundary and call it "farfield1". Next, create a named selection for the right half of the outer boundary and call it "farfield2". Lastly, create a named selection for both sides of the inner circle(cylinder) and call it "cylinderwall". When creating the third named selection, make sure that you included both halves of the circle. You will have to hold down control to select both edges.
